Isometric exercise apparatus and storage rack therefor

ABSTRACT

The present invention relates generally to exercise equipment and more specifically, to an isometric exercise apparatus and a storage rack therefor. The isometric exercise apparatus includes a frame which has a base and a sidewall joined to the base. The base has an exercise platform for supporting a user&#39;s body. Also provided is a restraint arm assembly connected to the frame. The arm restraint assembly includes a swing arm pivotally connected to the base, a restraint arm carried by the swing arm and positionable above the exercise platform to inhibit movement of a portion of the user&#39;s body so as to allow the user to perform isometric exercises. An indexing assembly is provided to fix the swing arm in a predetermined angular position selected from a set of discrete angular positions relative to the base. At least one limb restraint accessory is positionable at predetermined locations along the base for inhibiting movement of the user&#39;s limb so as to allow the user to perform isometric exercises. The apparatus can rapidly be adapted or configured to target a plurality of joint angles to work different muscle groups (or different muscles within the same muscle group) for an enhanced isometric workout.

RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No.15/433,820 filed on Feb. 24, 2017, which is a continuation of U.S.patent application Ser. No. 14/297,203 filed on Jun. 5, 2014, now issuedto U.S. Pat. No. 9,592,416, which is a continuation of U.S. patentapplication Ser. No. 13/750,305 filed on Jan. 25, 2013, now issued asU.S. Pat. No. 8,758,203, which is a continuation of U.S. patentapplication Ser. No. 13/137,686 filed on Sep. 2, 2011, now issued asU.S. Pat. No. 8,376,917, which is a continuation of U.S. patentapplication Ser. No. 12/385,079 filed on Mar. 30, 2009, now issued toU.S. Pat. No. 8,029,423.

FIELD OF THE INVENTION

The present invention relates generally to exercise equipment and morespecifically, to an isometric exercise apparatus and a storage racktherefor.

BACKGROUND OF THE INVENTION

A growing segment of the population suffers from obesity, hypertensionand diabetes and other related health conditions, commonly referred toas lifestyle ailments or diseases. Such lifestyle ailments can betreated or avoided altogether with adequate exercise and a proper diet.As a result, people are increasingly seeking to maintain or achieve ahealthy body weight and get fit through increased exercise. Suchexercise may be obtained through participation in team or individualsports, or alternatively, by performing any of a variety of exerciseregimens, protocols or programs which may include aerobic and/oranaerobic exercises.

Many exercise programs include strength training routines designed tostimulate muscle growth and increase muscular strength. Such routineshave been shown to confer on the exercising individual several healthbenefits including: (1) increasing cardiovascular efficiency resultingin lower blood pressure and a decrease in heart disease; (2) increasingbone density resulting in a reduced risk of osteoporosis and arthritis;and (3) increasing metabolic activity resulting in sustainable fat loss.Some strength training routines require the exercising individual toperform certain dynamic or isotonic movements using free weights orspecialized machines which target a specific muscle or muscle group andwork it through a range of motion. During these dynamic movements, thelength of the targeted muscle changes as the muscle is being contractedthrough the range of motion. The popularity of such routines hasresulted in a great number of dynamic exercise machines having beendeveloped and manufactured. Such equipment can now be seen in almostevery health and fitness club across the country.

However, under certain circumstances, resistance training which involvesdynamic movements (and the equipment employed to perform such exercises)can pose an increased risk of physical injury to the individual due tothe inertia effect exerted by the equipment. Moreover, this type ofresistance training may not be suitable for certain individuals,particularly those who are recovering from an existing injury or illnessand are being rehabilitated.

Another type of strength training involves the performance of isometricexercises (also referred to as isometrics). During such exercises thejoint angle and the length of the associated muscle do not change duringcontraction. Studies have shown that training with isometrics canincrease peak muscle power up to thirty-two percent (32%) more than withdynamic movements and can increase muscular endurance up toone-hundred-and-twelve percent (112%) over what can be achieved withdynamic movements. Moreover, since isometrics tend to be inertia free,the risk of physical injury to the individual tends to be substantiallymitigated thereby making such exercises more suitable for rehabilitativeapplications.

While the benefits of isometrics have been recognized for over fiftyyears, this form of training has not had the same popularity as that ofdynamic resistance training. This may be due in part to the fact thatvery little equipment has been developed specifically for theperformance of isometrics. Isometrics are usually performed by workingthe joint and muscle against an immovable force or restraint.Traditionally, this restraint has been provided by a structural item,such as a floor or a wall. However, while these types of restraints tendto be adequate for certain joint angles and muscles, it may be moredifficult to properly work other joint angles and muscles isometricallyusing these restraints. Based on the foregoing, there is a real need forexercise equipment specifically designed for isometrics.

In light of the foregoing, it would be advantageous to have an isometricexercise apparatus which provides an external restraint source for aplurality of joint motions. Preferably, such an apparatus could beconfigured easily and quickly to create different types of restraint forenhanced versatility thereby offering the exercising individual theoption to perform a variety of isometric exercises.

SUMMARY OF THE INVENTION

In accordance with one broad embodiment of the present invention, thereis provided an isometric exercise apparatus includes a frame which has abase and a sidewall joined to the base. The base has an exerciseplatform for supporting a user's body. Also provided is a restraint armassembly connected to the frame. The arm restraint assembly includes aswing arm pivotally connected to the base, a restraint arm carried bythe swing arm and positionable above the exercise platform to inhibitmovement of a portion of the user's body so as to allow the user toperform isometric exercises. An indexing assembly is provided to fix theswing arm in a predetermined angular position selected from a set ofdiscrete angular positions relative to the base. At least one limbrestraint accessory is positionable at predetermined locations along thebase for inhibiting movement of the user's limb so as to allow the userto perform isometric exercises.

In another feature, the frame is collapsible. The base is hingedlyconnected to the sidewall. Additionally, the sidewall is moveablebetween a first, in-use position and a second, out-of-use position. Whenin the first, in-use position, the sidewall is oriented at leastsubstantially perpendicular to the base. When in the second, out-of useposition, the sidewall is collapsed against the base. In a furtherfeature, the apparatus further includes locking means engageable withthe base and the sidewall for maintaining the sidewall in the first,in-use position.

In yet another feature, the sidewall has a front face oriented towardsthe base and an opposing back face. The apparatus further includes atleast one pad carried on the front face of the sidewall for cushioning aportion of the user's body. The at least one pad includes a first padand a second pad spaced apart from the first pad.

In still a further feature, the base has a first side, a second sideopposite the first side, a third side extending between the first andsecond sides, and a fourth side opposite the third side and extendingbetween the first and second sides. The first side is provided with afirst handle and the second side is provided with a first pair of spacedapart castors. Additionally, the third side is provided with a secondhandle and the fourth side is provided with a second pair of spacedapart castors.

In an additional feature, the at least one limb restraint attachment isa first limb restraint attachment. The apparatus includes a second limbrestraint attachment releasably mounted to the exercise platform. In onefeature, the second limb restraint attachment is a dual foot restraintattachment. In another feature, the second limb restraint attachment isa footpad.

In a further feature, the restraint arm assembly is releasably connectedto the frame.

In yet another feature, the indexing assembly includes an indexing platemounted to the base and an indexing pin releasably engageable with aportion of the indexing plate and a portion of the swing arm to fix theswing arm to the indexing plate. The indexing plate has a plurality ofindexing apertures defined therein. Each indexing aperture correspondsto one of the predetermined angular positions. The swing arm has a firstend pivotally connected to the base, a second end attached to therestraint arm and includes at a location intermediate the first andsecond ends a bore. The bore of the swing arm is alignable with one ofthe indexing apertures to allow insertion of the indexing pintherethrough. The plurality of indexing apertures is disposed in asemi-circular arrangement along the indexing plate. In still anotherfeature, the indexing assembly is provided with locking means to preventdisengagement of the indexing pin from the indexing plate and the swingarm.

In an additional feature, the base has a length and width. The restraintarm extends generally parallel to the width of the base. Moreover, therestraint arm has a first portion attached to the swing arm and a secondportion releasably connected to the sidewall. In a further feature, thesidewall has defined therein a plurality of indexing bores. Eachindexing bore corresponds to one of the predetermined angular positionsand is configured to receive the second portion of the restraint arm.The restraint arm includes a tubular body and a retractable locking pinassembly housed within the tubular body. The locking pin assemblyincludes a locking pin provided with a tip. The tip defines the secondportion of the restraint arm configured for insertion into one of theindexing bores of the sidewall. The locking pin is moveable between anengaged position and a retracted position. When in the engaged position,the locking pin engages the sidewall and its tip is received within oneof the indexing bores and when in the retracted position, the lockingpin is disengaged from the sidewall. In an additional feature, thelocking pin is biased in the engaged position.

In still another feature, the base includes a plurality of slots definedinto the outer margins of the base. Each slot is disposed at one of thepredetermined locations and configured to receive a portion of the atleast one limb restraint attachment therein. Additionally, the base hasa first side, a second side opposite the first side, a third sideextending between the first and second sides, and a fourth side oppositethe third side and extending between the first and second sides. Theplurality of slots includes at least one slot disposed along the firstside of the base, at least one slot disposed along the second side ofthe base and at least one slot disposed along the third side of thebase.

In yet another feature, the base has a longitudinal axis and atransverse axis perpendicular to the longitudinal axis. At least some ofthe slots of the plurality are oriented generally perpendicular to thelongitudinal axis of the base. In one additional feature, at least someof the slots of the plurality are oriented generally perpendicular tothe transverse axis of the base. In another additional feature, at leastsome of the slots of the plurality are canted relative to thelongitudinal axis of the base.

In still another feature, the at least one limb restraint attachmentincludes a connector arm and a retaining member. The connector arm has afirst end and a second end for insertion into one of the plurality ofslots. The retaining member is supported on the first end of theconnector arm for restraining a portion of the user's limb. The retainermember has a shape selected from the group consisting of: (a) a U-shape;and (b) a C-shape. In an alternative feature, the retainer member may beformed with one of a partially open cuff and a fully closed cuff.

In a further feature, the retainer member is releasably connected to theconnector arm. The retainer member is positionable on the connector armin a first orientation and in a second orientation. The firstorientation is substantially perpendicular to the second orientation. Inan additional feature, the at least one limb restraint attachmentfurther includes means for securing the second end of the connectorwithin one of the plurality of slots. In yet another feature, the atleast one limb restraint attachment is an arm restraint attachment.

In accordance with another broad embodiment of the present invention,there is provided an isometric exercise apparatus includes a frame whichhas a base and a sidewall joined to the base. The base has an exerciseplatform for supporting a user's body. Also provided, is a restraint armassembly connectable to the frame. The restraint assembly includes aswing arm pivotally connectable to the base. A restraint arm ismountable to the swing arm and positionable above the exercise platformto inhibit movement of a portion of the user's body so as to allow theuser to perform isometric exercises. An indexing assembly is providedfor fixing the swing arm in a predetermined angular position selectedfrom a set of discrete angular positions relative to the base. At leastone limb restraint accessory is positionable at predetermined locationsalong the base for inhibiting movement of the user's limb so as to allowthe user to perform isometric exercises.

In accordance with yet another broad embodiment of the presentinvention, there is provided a kit for an isometric exercise apparatusand storage rack therefor. The kit includes a collapsible frame having abase and a sidewall joined to the base. The base has an exerciseplatform for supporting a user's body. Also provided is a restraint armassembly connectable to the frame. The restraint assembly includes aswing arm pivotally connectable to the base. A restraint arm ismountable to the swing arm and positionable above the exercise platformto inhibit movement of a portion of the user's body so as to allow theuser to perform isometric exercises. An indexing assembly is providedfor fixing the swing arm in a predetermined angular position selectedfrom a set of discrete angular positions relative to the base. At leastone limb restraint accessory is positionable at predetermined locationsalong the base for inhibiting movement of the user's limb so as to allowthe user to perform isometric exercises. The kit further includes a rackstructure for suspending the frame when in a collapsed state.

BRIEF DESCRIPTION OF THE DRAWINGS

The embodiments of the present invention shall be more clearlyunderstood with reference to the following detailed description of theembodiments of the invention taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a front left perspective view of an isometric exerciseapparatus depicted in a deployable, ready-to use configuration, with thesidewall of the apparatus frame shown in an upstanding position relativeto the base of the apparatus frame, according to an embodiment of thepresent invention;

FIG. 2 is a rear right perspective view of the isometric exerciseapparatus shown in FIG. 1;

FIG. 3 is a top plan view of the isometric exercise apparatusillustrated in FIG. 1 with a plurality of motion restraint accessories(shown in dashed lines) attached to the outer edges of the base panel ofthe apparatus frame at various locations;

FIG. 4a is a front elevation view of the isometric exercise apparatusshown in FIG. 1, with one of the arm restraint accessories removed forclarity;

FIG. 4b is a magnified detail view of the restraint arm assemblyillustrated in FIG. 4a showing the swing arm and the indexing plate; theindexing key having been omitted to better reveal the keyhole defined inthe swing arm;

FIG. 5 is an end view of the isometric exercise apparatus shown in FIG.1;

FIG. 6 is another end view of the isometric exercise apparatus takenfrom the opposite end to that illustrated in FIG. 5, the footpadattachment shown in FIG. 5 having been replaced with a dual footrestraint attachment;

FIG. 7 is a bottom plan view of the base panel shown in FIG. 1 taken inisolation, with the plurality of motion restraint accessories omittedfor clarity and a plurality of slots cut into the base shown in dashedlines;

FIG. 8a is an enlarged, isolated front elevation view of one of theslots defined in one of the outer edges of the base panel shown in FIG.1;

FIG. 8b is a cross-sectional view of the slot shown in FIG. 8a takenalong line “8 b-8 b”;

FIG. 8c is a top plan view of the slot illustrated in FIG. 8a showing aconnector arm of the arm restraint attachment received within the slot;

FIG. 9 is a perspective view of the isometric exercise apparatus similarto that illustrated in FIG. 1, showing the horizontal restraint memberof the restraint arm assembly being moved from a first position to asecond position;

FIG. 10 is an enlarged partial, rear perspective view of the indexingplate of the restraint arm assembly illustrated in FIG. 4a showing theindexing key engaged within one of the keyholes defined in the indexingplate and rotated such that the protruding locking tabs at the end ofthe indexing key are misaligned with the slots of the keyhole;

FIG. 11 is a side elevation view of the indexing key shown in FIG. 10;

FIG. 12a is a partial, enlarged cross-sectional view of the restraintarm of the restraint arm assembly illustrated in FIG. 9 with its lockingpin shown engaged within one of the bores defined in the panel of thesidewall;

FIG. 12b is a magnified detail view of the encircled portion “12 b”shown in FIG. 12 a;

FIG. 12c is a partial, enlarged cross-sectional view of the restraintarm similar to that shown in FIG. 12a , except that the locking pin isnow shown moved to its retracted, disengaged position;

FIG. 12d is a magnified detail view of the encircled portion “12 d”shown in FIG. 12 c;

FIG. 13a is an isolated perspective view of the first arm restraintattachment shown in FIG. 1;

FIG. 13b is a cross-sectional view of the connector arm of the first armrestraint attachment shown in FIG. 13a taken along line “13 b-13 b”;

FIG. 13c is an exploded perspective view of the first arm restraintattachment shown in FIG. 13 a;

FIG. 13d is a side elevation view of the locking key shown in FIG. 13 c;

FIG. 13e is a perspective view of a retaining member according to analternate embodiment to that shown in FIG. 13 c;

FIG. 14a is an isolated perspective view of a first alternate armrestraint attachment according to alternate embodiment to that shown inFIG. 14 a;

FIG. 14b is an exploded perspective view of the first alternate armrestraint attachment shown in FIG. 14 a;

FIG. 15 is an isolated perspective view of the foot pad shown in FIG. 1;

FIG. 16 is an isolated perspective view of the dual foot restraintattachment shown in FIG. 6;

FIG. 17 is a front elevation view of a user positioned within theisometric exercise apparatus of FIG. 1, shown performing an isometricexercise utilizing the footpad accessory as a restraint to urgecontraction of the calf muscles of the user's legs; the arm restraintaccessories having been omitted for the sake of clarity;

FIG. 18 is a front elevation view of a user positioned within theisometric exercise apparatus of FIG. 1, shown performing an isometricexercise utilizing the horizontal restraint member of the restraint armassembly as a restraint to urge contraction of certain of user's hipflexor muscles; the arm restraint accessories having been omitted forthe sake of clarity;

FIG. 19 is a front elevation view of a user positioned within theisometric exercise apparatus of FIG. 1, shown performing an isometricexercise utilizing the horizontal restraint member of the restraint armassembly as a restraint to urge contraction of certain of the user'sabdominal muscles; the arm restraint accessories having been omitted forthe sake of clarity;

FIG. 20 is a front elevation view of a user positioned within theisometric exercise apparatus of FIG. 1, shown performing an isometricexercise utilizing the horizontal restraint member of the restraint armassembly as a restraint to urge contraction of certain of the user'sback muscles; the arm restraint accessories having been omitted for thesake of clarity;

FIG. 21 is a top plan view of a user positioned within the isometricexercise apparatus of FIG. 1, shown performing an isometric exerciseutilizing the arm restraint attachment as a restraint to urgecontraction of the user's rhomboid muscles;

FIG. 22 is a perspective view of a user positioned within the isometricexercise apparatus of FIG. 1, shown performing an isometric exerciseutilizing the sidewall as a restraint to urge contraction of the one ofthe user's hip flexor muscles;

FIG. 23 is a partial perspective view of a user positioned within theisometric exercise apparatus of FIG. 1, shown performing an isometricexercise utilizing the dual foot restraint attachment as a restraint tourge contraction of certain of the user's lower leg muscles;

FIG. 24 is a partially exploded, perspective view of the isometricexercise apparatus illustrated in FIG. 1 showing the restraint armassembly, the footpad, the arm restraint attachments and the arc-shapedpads exploded from the apparatus frame;

FIG. 25 is an isolated, partially exploded, rear perspective view of aportion of the isometric exercise apparatus illustrated in FIG. 2showing the side locking bars exploded from the apparatus frame;

FIG. 26 is a perspective view of the isometric exercise apparatusillustrated in FIG. 1 showing apparatus frame absent the restraint armassembly, the footpad, the arm restraint attachments, the arc-shapedpads and the side locking bars, the side panel being moved to itscollapsed position and the isometric exercise apparatus in itsout-of-use, storage configuration;

FIG. 27a is an isolated perspective view of one of the receivingstations defined in the second face of the sidewall shown in FIG. 26;

FIG. 27b is an isolated perspective view of one of the receivingstations defined in the top face of the base shown in FIG. 26;

FIG. 28 is a perspective view of a rack member for holding at least oneisometric exercise apparatus in its out-of use storage configuration, inaccordance with an embodiment of the present invention;

FIG. 29 is a side elevation view of the rack member shown in FIG. 28;

FIG. 30 is a partially exploded perspective view of the rack membershown in FIG. 28 with an isometric exercise apparatus in its out-of usestorage configuration, in the midst of being mounted onto the rackmember;

FIG. 31 is a perspective view of the rack member shown in FIG. 28 withan isometric exercise apparatus mounted thereon for storage;

FIG. 32 is an enlarged, partial front elevation view of the rack memberillustrated in FIG. 28, showing one of the castors of the apparatusframe received within a slot defined in the first side support member ofthe rack frame;

FIG. 33 is a front left perspective view of an alternative embodiment tothat illustrated in FIG. 1, showing an isometric exercise apparatusdepicted in a deployable, ready-to use configuration, with the sidewallof the apparatus frame shown in an upstanding position relative to thebase of the apparatus frame;

FIG. 34 is a top plan view of the isometric exercise apparatusillustrated in FIG. 33;

FIG. 35 is a bottom plan view of the base panel shown in FIG. 33 takenin isolation, with the plurality of motion restraint accessories omittedfor clarity and a plurality of slots cut into the base shown in dashedlines;

FIG. 36 is an enlarged partial perspective view of the isometricexercise apparatus illustrated in FIG. 33, showing the base panelhingedly connected to the sidewall panel by a hinge assembly;

FIG. 37 is an enlarged, isolated front elevation view of one of theslots defined in one of the outer edges of the base panel shown in FIG.33;

FIG. 38 is an exploded perspective view of one of the arm restraintattachments shown in FIG. 33;

FIG. 39 is a partial perspective view of the base panel illustrated inFIG. 33 showing the arm restraint attachment depicted in FIG. 38 and itslocking pin shown exploded from the base panel;

FIG. 40 is an exploded perspective view of the other arm restraintattachment shown in FIG. 33;

FIG. 41 is an isolated perspective view of the retaining member of theother arm restraint attachment shown in FIG. 33;

FIG. 42 is a perspective view of an alternate arm restraint attachmentto that shown in FIG. 38; and

FIG. 43 is an isolated perspective view of the retaining member of thealternate arm restraint attachment shown in FIG. 42.

DETAILED DESCRIPTION OF THE EMBODIMENTS OF THE INVENTION

The description which follows, and the embodiments described therein areprovided by way of illustration of an example, or examples of particularembodiments of principles and aspects of the present invention. Theseexamples are provided for the purposes of explanation and not oflimitation, of those principles of the invention. In the descriptionthat follows, like parts are marked throughout the specification and thedrawings with the same respective reference numerals.

Referring to FIGS. 1 through 6, there is shown an apparatus forperforming isometric exercises generally designated with referencenumeral 20. The isometric exercise apparatus 20 has a frame 22 whichincludes a base 24 and a sidewall 26 hingedly connected to the base 24along a portion thereof. The base 24 is designed for placement on asupport surface such as a floor.

The base 24 includes a substantially rectangular panel 27 provided witha top face 28 (see FIG. 3) and an opposed bottom face 30 (see FIG. 7).As best shown in FIG. 7, the shape of the panel 27 is defined by a pairof opposed, relatively short first and second sides 32 and 34, and apair of opposed, relatively long, first and second sides 36 and 38extending between the short sides 28 and 30. The first short side 32meets the first long side 36 at a first radiused corner 40, and joinsthe second long side 38 at a second radiused corner 42. The tworemaining corners of the panel 27—third and fourth radiused corners 44and 46—are formed by the juncture of the second short side 34 and eachof the first and second long sides 36 and 38, respectively. At alocation approximately four-fifths of the way between the first andsecond long sides 36 and 38 proximate the first and third corners 40 and44, the outer edges 48 and 50 of the first and second short sides 32 and34 come in a short distance toward each other to define shoulderportions 52 and 54. Beyond the shoulder portions 52 and 54, the outeredges 48 and 50 are parallel to each other as they extend toward theirrespective corners 40 and 44.

The panel 27 may be constructed of a relatively rigid, ABS plastic. Itwill however be appreciated that other materials selected for theirrelatively light weight and their enhanced stiffness, strength and wearresistance characteristics, may be used to make the base 24 as well, forinstance, polyvinylchloride (PVC) or polypropylene. The panel 27 may befabricated with a number of weight reducing holes or apertures definedtherein to facilitate transport and handling of the isometric exerciseapparatus 20 and to enhance its portability.

In the preferred embodiment, the base 24 has a length L₁ which measuresseventy-two (72) inches, and a width W₁ which measures thirty-three (33)inches, wherein the length L₁ is measured between the outer edges 48 and50 at the second and fourth corners 42 and 46 and the W₁ is measuredbetween the outer edges 62 and 64 at the third and fourth corners 44 and46. The length L₁ and the width W₁ of the base 24 are selected toaccommodate the body shape and size of a plurality of different users ofthe isometric exercise apparatus 20. Of course, the dimensions of thebase 24 could be adjusted to suit a particular application or type ofuser.

As best shown in FIG. 7, inwardly of the outer edge 48 and at a locationcloser to the shoulder portion 52 than to the corner 42, there is agenerally rectangular aperture 56 which extends between the top andbottom faces 28 and 30 of the base 24. The aperture 56 is sized to allowthe fingers of a person's hand to extend therethrough. In this manner, afirst handle 58 fashioned by the outer edge 48 and the aperture 58, isincorporated into the first short side 32. Disposed opposite the firsthandle 58, is a pair of spaced apart castors 66 and 68 which areattached to the outer edge 50 of the second short side 34. The firsthandle 58 may be grasped by an individual and when used in conjunctionwith castors 66 and 68 may be used to facilitate transport of theapparatus 20 or the base 24 from one location to another.

The frame 22 is further provided with a second handle 60 incorporatedinto the first long side 36 midway between the first and third corners40 and 44. In like fashion to the first handle 58, the second handle 60is formed by the outer edge 62 of the first long side 36 and a generallyrectangular aperture 70 extending between the top and bottom faces 28and 30 of the base 24. A pair of castors 72 and 74 disposed opposite thesecond handle 60 is attached to the outer 64 of the second long side 38.Thus arranged, the second handle 60 can be used in conjunction with thecastors 72 and 74 to roll the apparatus 20 to a desired location.

Relatively large, first and second bores 76 and 78 are located on eitherside of the second handle 60 at spaced apart locations. The first bore76 is disposed near the first corner 40, while the second bore 78 isformed near the third corner 44. Each bore 76, 78 is sized to receive asupport arm 82, 84 of a rack 80 (as best shown in FIGS. 22 and 23). Aswill be explained in greater detail below, the isometric exerciseapparatus 20 may be hung on the rack 80 from the support arm 82 and 84,for storage when not in use.

As shown in FIG. 7, the bottom face 30 is provided with severalgrip-enhancing bands or strips 90, 92, 94 and 96. These bands tend toincrease the friction which exists between the base 24 and the supportsurface (not shown) and tends to mitigate the risk that the isometricexercise apparatus 20 will move or shift during use. The first band 90is relatively short and generally rectangular. It runs between the firstcorner 40 and the first bore 66. The second band 92 is also generallyrectangular but is relatively longer than the first band 90, as itextends between the first and second bores 76 and 78. Midway between thebores 76 and 78, the width of the second band 92 narrows to accommodatethe second handle 60. The third band 94 is generally similar in size andshape to the first band 90 and extends between the second bore 78 andthe third corner 44. The fourth band 96 is configured differently thanthe others in that it is built up of four portions 98, 100, 102 and 104which are configured to frame a rectangular space 108.

In this embodiment, the bands 90, 92, 94 and 96 are fixed to the bottomface of the base 24 with an adhesive. However, this need not be the casein every application. In other embodiments, the grip-enhancing bandscould be attached to the base using hook and loop fasteners or othertypes of fasteners.

Referring now to FIGS. 1 to 3, the top face 28 has a rectangular station110 formed therein. The boundaries of the station 110 are delimited by aframe 112 having margins 114, 116, 118 and 120. Each margin 114, 116,118 extends outwardly toward a corresponding outer edge 48, 50, 64,respectively. Secured within the station 110 is an exercise platform 122which supports the user's body while he/she is performing exercisesusing the isometric exercise apparatus 20. The exercise platform 122 mayattached to the panel using adhesives or fasteners. In this embodiment,the exercise platform 122 is a resilient pad 124 provided with a memoryfoam core sheathed in a durable material, such as vinyl. However, inalternative embodiments, the exercise platform can be a rubber mat or amat made of any other material exhibiting suitable resiliency and wearresistance properties.

Defined in, and extending through, the top and bottom faces of theexercise platform 122 is an aperture 126 (visible in FIG. 5). Theaperture 126 is aligned with, and provides access to, a threaded blindbore (not shown) formed in the top face 28 of the base 24. The blindbore is sized to receive the threaded connector of an accessory orattachment of the isometric exercise apparatus 20, for example, of thefootpad 128 shown in FIG. 1 or the dual foot restraint accessory 132shown in FIG. 6.

As best shown in FIGS. 1 and 2, the base 24 carries on its top face 28three hinge tubes oriented generally parallel to the outer edges 62 and64—a first hinge tube 140, a second hinge tube 142 and a third hingetube 144 disposed between the first and second hinge tubes 140 and 142.A gap G₁ separates the first hinge tube 140 from the third hinge tube144. Similarly, a gap G₂ exists between the second hinge tube 142 andthe third hinge tube 144. The hinge tubes 140, 142 and 144 are disposedin the region which lies between the margin 120 and the outer edge 62.Each hinge tube 140, 142, 144 has a passageway (not shown) definedtherein. The passageways are disposed in alignment with each other so asto allow a portion of the hinge pin or rod 146 to pass through each ofthem. As will be explained in greater detail below, the hinge tubes 140,142 and 144 and the hinge rod 146 form part of the hinge connectionbetween the base 24 and the sidewall 26.

Referring now to FIGS. 3, 5, 6 and 8, a plurality of slots genericallyidentified with reference numeral 150 extends from the outer edges 48,50 and 64, into the panel 27 and toward the station 110. As will beexplained in greater detail below, the slots 150 are adapted to receiveand retain a connector arm of an accessory of the isometric exerciseapparatus 20 (as shown in FIG. 8c ). In the preferred embodiment, theslots 150 include twelve slots 150 a, 150 b, 150 c, 150 d, 150 e, 150 f,150 g, 150 h, 150 i, 150 j, 150 k and 150 l, disposed at differentlocations along the sides 32, 34 and 38 and having differentorientations relative to their corresponding outer edges 48, 50 and 64.The relative position and orientation of each slot 150 are now describedin greater detail.

Slot 150 a is formed in the second short side 34 between the fourthcorner 46 and the castor 66 (but closer to the castor 66) and extendsperpendicular to the outer edge 50. Slot 150 b is also formed in theshort side 34, but it is disposed very close to the fourth corner 46 andis cut on a slant. More specifically, slot 150 b is oriented at an angleof approximately 30 degrees as measured from the outer edge 50. Slots150 c, 150 d and 150 e are positioned adjacent to each other on thesecond long side 38 proximate the fourth corner 46. Slot 150 c is cantedaway from the fourth corner 46 and forms an angle of 60 degrees with theouter edge 64. Slot 150 d lies between slots 150 c and 150 e and has aperpendicular orientation relative to the outer edge 64. Slot 150 e isdisposed furthest from the fourth corner 46. In like fashion to slot 150c, slot 150 e also extends at angle of 60 degrees as measured from theouter edge 64. However, in the case of slot 150 e, the direction ofinclination is toward the fourth corner 46. Still moving away from thefourth corner 46 along the outer edge 64, there is slot 150 f. Slot 150f is oriented toward the fourth corner and has an angle of inclinationrelative to the outer edge 64 of 30 degrees.

The arrangement of slots 150 g, 150 h, 150 i, 150 j, 150 k and 150 lalong the first short side 32 and the second long side 38 is the mirrorimage of the layout of slots 150 f, 150 e, 150 d, 150 c, 150 b and 150 a(respectively) along the second short side 34 and the second long side38, such that the arrangement of slots 150 g through 150 l requires nofurther description.

The arrangement and orientation of slots 150 a to 150 l affords a userthe opportunity to perform many different exercises using the apparatus20. Simply by changing the placement of the accessory (genericallyidentified with reference numeral 152) from one slot to another, theuser can rapidly adapt the apparatus 20 to target a plurality of jointangles to work different muscle groups (or different muscles within thesame muscle group) for an enhanced isometric workout. As will beapparent to a person skilled in the art, this feature tends to make theisometric exercise apparatus 20 very versatile. To illustrate thisversatility, a plurality of accessories 152 a, 152 c, 152 d, 152 f, 152i, 152 j, 152 k and 152 l mounted within their respective slots 150 a,150 c, 150 d, 150 f, 150 i, 150 j, 150 k and 150 l are shown in dashedlines in FIG. 3.

While in the preceding paragraphs an arrangement of twelve slots wasdescribed, it should be appreciated that this need not be the case inevery application. In other embodiments, a different number of slotscould be used. Moreover, the slots could be laid out differently alongthe outer edges of the panel and/or could have a different orientation(i.e. perpendicular or slanted relative to the outer edge with varyingangles).

But for differences arising from their varying orientations, the slots150 all have a generally similar structure, such that a description ofone representative slot—slot 150 i—will suffice for the others.Referring now to FIGS. 8a and 8b , slot 150 i has a tapered throat 154(widest at the outer edge 48 and narrowing in the direction of the slot)which tends to serve as a guide for locating the connector arm 156 ofthe arm restraint attachment 152 i into the slot 150 i. The throat 154opens onto a relatively large central opening 160 whose profile isgenerally oblong. Bounding on either side, and opening onto, the centralopening 160 are first and second C-shaped channels 162 and 164. Thechannels 162 and 164 are sized to accommodate the travel of locking pins166 and 168 along the channels (as best shown in FIG. 8c ) whichprotrude from the terminal end 170 of the connector arm 156. Eachchannel 162 and 164 has a back portion 172 and a pair of opposed, upperand lower arm portions 174 and 176 joined to the back portion 172. Thelower arm portion 176 has, at spaced apart locations, cutaways 178 whichopen onto locking recesses 180.

In the preferred embodiment, the lower arm portion 76 is provided withthree cutaways 178 a, 178 b and 178 c; each cutaway giving access to acorresponding locking recess 180 a, 180 b, 180 c, respectively. Thefirst cutaway 178 a and its corresponding locking recess 180 a islocated closest to the throat 154 while the third cutaway 178 c and itscorresponding locking recess 180 c is located furthest away from it. Thesecond cutaway 178 b and its corresponding locking recess 180 b isdisposed intermediate the first and third cutaways 178 a and 178 c andtheir respective locking recesses 180 a and 180 c. In alternativeembodiments, the number of cutaways and locking recesses could be variedto suit the particular application.

Each locking recess 180 is defined by a relatively short, substantiallyvertical wall portion 181, a downwardly sloping wall portion 182, ahorizontal wall portion 184, a vertical wall portion 186 and anoverhanging lip portion 188. The substantially wall portion 181 extendsfrom the cutaway 178 to connect to the downwardly sloping wall portion182. The wall portion 182 joins the horizontal wall portion 184 at thefirst end 190 thereof. At the opposite second end 192, the horizontalwall portion 184 meets the lower end 194 of the vertical wall portion186. The overhanging lip portion 188 is connected to the upper end 196of the vertical wall portion 186 and runs back toward the cutaway 178generally parallel to horizontal wall portion 184.

When the locking pins 166 and 168 of the connector arm 154 are receivedwithin the locking recesses 180 a, the accessory 152 is at its mostextended position 200 (see the accessory 152 c shown in FIG. 3). Theaccessory 152 is in its partially retracted position 202, when thelocking pins 166 and 168 are accommodated in the locking recesses 180 b(see the accessory 152 a shown in FIG. 3). Lastly, the accessory 152 canbe moved to its most retracted position 204 by moving the locking pins166 and 168 into the locking recesses 180 c (see the accessory 152 ishown in FIG. 3).

As will be appreciated by a person skilled in the art, the provision ofa plurality of cutaways 178 and locking recesses 180 allows the user toadjust the distance by which an accessory 152 protrudes beyond the outeredge 64. This functionality permits the user to customize the isometricexercise apparatus 20 to suit his/her body shape or size. Moreover, bymodifying this distance, the apparatus 20 can be adapted to allow theuser to isolate different joint angles and perform different exercisesor cause different muscles to be contracted.

Referring now to FIGS. 1, 2 and 4 a, the sidewall 26 will now bedescribed in greater detail. The sidewall 26 includes a substantiallyrectangular panel 212 provided with a first face 214 (see FIG. 1) and anopposed second face 216 (see FIG. 2). The shape of the panel 212 isdefined by a pair of opposed, relatively short first and second sides218 and 220, and a pair of opposed, relatively long, first and secondsides 222 and 224 extending between the short sides 218 and 220. Thefirst short side 218 meets the first long side 222 at a first corner226, and joins the second long side 224 at a second corner 228. The tworemaining corners of the panel 212—third and fourth corners 230 and232—are formed by the juncture of the second short side 220 and each ofthe first and second long sides 222 and 224, respectively.

The panel 212 may be constructed of a material similar to that used forpanel 27 of the base 24. For reasons of enhanced visibility oraesthetics, the panel may be made transparent or translucent. In thepreferred embodiment, the sidewall 26 has a length L₂ equal to thelength L₁ of the base 24 and the width W₂ (as measured between the outeredges 300 and 302 of the long sides 222 and 224) of 26.5 inches.

As best shown in FIG. 2, protruding from the outer edge 234 of secondlong side 224 are a plurality of hinge knuckles 236, 238, 240 and 242.Hinge knuckles 236 and 238 are located at the first and fourth corners228 and 232, respectively, while the hinge knuckles 238 and 240 arelocated at intermediate locations between the first and fourth corners228 and 232. These locations correspond to the gaps G₁ and G₂ definedbetween the first and third hinge tubes 140 and 144 and the second andthird hinge tubes 142 and 144. Each hinge knuckle 236, 238, 240 and 242has a passageway (not shown) which when aligned with the passagewaysdefined in the hinge tubes 140, 142 and 144 allow a portion of the hingepin or rod 146 to pass therethrough.

Thus formed, the hinge connection between the base 24 and the sidewall26 allows the sidewall 26 to be moved between a collapsed position 250(shown in FIG. 26) and an upstanding position 252 (shown in FIGS. 1 and2). When the sidewall 26 is moved to its collapsed position 250 thefirst face 214 of the sidewall 26 is brought opposite the top face 28 ofthe base 24 and the apparatus 20 is now in its out-of-use, storageposition 251. In the upstanding 252, the sidewall 26 lies perpendicularor at least substantially perpendicular to the base 24 as shown in FIGS.5 and 6 and the apparatus occupies its in-use position 253.

While it is generally preferred for purposes of storage and minimizingthe footprint occupied by the isometric exercise apparatus 20 (i.e.enhancing the compactness of the apparatus) that the frame 22 becollapsible, it will appreciated that this need not be the case in everyapplication. In an alternative embodiment, the frame could be configuredsuch that the sidewall is maintained in a fixed position relative to thebase. In such an embodiment, the sidewall could extend perpendicular tothe base and be permanently joined to the base along an edge thereof.

Referring to FIGS. 2, 5, 6 and 20, the apparatus 20 is provided with apair of side locking bars 254 and 256 engageable with both the base 24and the sidewall 26, to retain the sidewall 26 in the upstanding in-useposition 252. Each locking bar 254, 256 has a generally L-shaped body258 defined by a first, relatively short arm 260 and a second,relatively long arm 262. The first short arm 260 includes a proximal end264 joined to the first short arm 260 and a distal or free end 266 (bestshown in FIG. 5). Located a very short distance inwardly of the free end266 is a first flange portion 268 which runs peripherally about thefirst short arm 260.

In like fashion to the first short arm 260, the second long arm 262 alsohas a proximal end 270 and a distal or free end 272. The proximal end270 is connected to the proximal end 264 of the first short arm 260. Thesecond long arm 262 is also provided with a second flange portion 274formed inwardly of the free end 272 and extending about the periphery ofthe second long arm 262.

The first and second flange portions 268 and 274 are configured to beretained within receiving stations (identified generically as) 276formed respectively in the sidewall 26 and the base 24. The sidewall 26has two receiving stations 276 a and 276 b—one to accommodate the firstflange portion 268 of each side locking bar 254, 256. Station 276 a isdefined in the outer edge 280 of the first short side 218 of panel 212and is disposed roughly midway between the first and second corners 226and 228. Station 276 b is similarly formed in the outer edge 282 of thesecond short side 220 midway between the third and fourth corners 230and 232.

Referring to FIG. 27a , each station 276 a, 276 b is defined by aportion of the second face 216 of the panel 212 and a plate 284 securedto the panel 212. More specifically, the second face 216 has athumbnail-shaped rebate 284 formed therein which is sized to receive thefree end 266 of the short arm 260. Similarly, the plate 284 has athumbnail-shaped cutaway 286 opposed, and aligned with, the rebate 284.Disposed intermediate the rebate 284 and the cutaway 286 is relativelylarger slot 288 which is designed to accommodate the first flangeportion 268. It will thus be understood by a person skilled in the artthat when the first flange portion is received within the slot 288, thelocking bar is captively retained between the panel 212 and the plate284 with its motion restricted in five degrees of movement.

In the preferred embodiment the plate 284 is secured to panel 212 bythree fasteners 287. In alternative embodiments, the plate could beattached differently. For instance, it could be welded onto the panel.

In like fashion to the sidewall 26, the base 24 is provided with tworeceiving stations 278 a and 278 b—one to accommodate the second flangeportion 274 of each side locking bar 254, 256. Station 278 a is definedin the outer edge 48 of the first short side 32 of panel 27 and isdisposed adjacent the corner 40. Station 278 b is similarly formed inthe outer edge 50 of the second short side 34 near the corner 44.

FIG. 27b shows an enlarged perspective view of station 278 a. Station278 a generally resembles station 276 a in that it too is defined by athumbnail-shaped rebate 290, a thumbnail-shaped cutaway 292 opposed, andaligned with, the rebate 290 and a relatively large slot 294 disposedintermediate the rebate 290 and the cutaway 292. In this case, the slot294 is designed to accommodate the second flange portion 274. Contraryto the station 276 a, the station 278 a is wholly formed by panel 27.

As best shown in FIG. 2, to prevent the accidental release of the secondflange portions 274 from the stations 278 a and 278 b, the apparatus 20is further provided with a pair of locking pins 303 for securing thelocking bars 254 and 256 in position. Each locking pin 303 is designedfor insertion through a first bore 305 defined in the base 24 adjacentthe station 278 a or 278 b (as the case may be) and a second bore 307formed into the second flange portion 274 of the locking bar 254 and256.

In other embodiments, the locking bars could be placed at differentlocations or configured differently. Alternatively, a single locking barmay be used. In a further alternative, the sidewall could be secured inthe in-use position using other locking means.

Referring now to FIG. 4a , the panel 212 has a pair of arc-shaped pads304 and 306 mounted to its first face 214 in opposition to each otherand proximate the corners 226 and 230. The back portion of the pads 304and 306 are nestled within arcuate recesses 307 and 308 formed withinthe first face 214 (as shown in FIG. 24). Preferably, the pads 304 and306 are retained within the recesses 307 and 308 by magnetic engagement.However, in alternative embodiments, other means could be used to attachthe pads to the panel 212. For instance, the pads and the recesses couldbe configured for a snap fit, or could be provided with co-operatingwith hook and loop fastener strips. In still another embodiment, thepads could be provided with one or more male connectors for insertioninto female sockets defined in the panel 212.

Each pad 304, 306 has a first end 312 carried a short distance away fromthe outer edge 222 and a second end 314 which projects beyond the outeredge 224. When the base 24 and the sidewall 26 are connected to eachother, the second end 314 abuts or nearly abuts the top face 28 of thebase 24. Preferably, the pads 304 and 306 have a core made of aresilient material, for example, memory foam or the like, and aresheathed in vinyl. However, it should be appreciated that othermaterials could be used to fabricate the pads. The location and shape ofthe pads 304 and 306 are selected to allow a user to comfortably urge aportion of his/her body against the pads while performing an exerciseusing the apparatus 20. In alternative embodiments, the pads could havea different shape and could be disposed differently on the first face214 of the panel 212.

The panel 212 is further provided with a plurality of spaced apart blindbores generically identified with reference numeral 310, extending intothe first face 214 of the panel 212. Preferably, the plurality of blindbores 310 include eleven bores—bores 310 a, 310 b, 310 c, 310 d, 310 e,310 f, 310 g, 310 h, 310 i, 310 j and 310 k—which are disposed acrossthe panel 212 in a semi-circular arrangement. The bores 310 a, 310 b,310 c, 310 d, 310 e, 310 f, 310 g, 310 h, 310 i, 310 j and 310 k areeach radially displaced from the plane of the base 24 by an angle θ_(a),θ_(b), θ_(c), θ_(d), θ_(e), θ_(f), θ_(g), θ_(h), θ_(i), θ_(j), θ_(k) andθ_(l), respectively. Angles θ_(g), θ_(h), θ_(i), θ_(j), θ_(k) and θ_(l)correspond to angles θ_(a), θ_(b), θ_(c), θ_(d), θ_(e) and θ_(f),respectively. In the preferred embodiment, θ_(a) measures 20 degrees;θ_(b) measures 40 degrees; θ_(c) measures 55 degrees; θ_(d) measures 70degrees; θ_(e) measures 80 degrees; θ_(f) measures 90 degrees; θ_(g)measures 90 degrees, θ_(h) measures 80 degrees; θ_(i) measures 70degrees; θ_(j) measures 55 degrees; θ_(k) measures 40 degrees; and θ_(l)measures 20 degrees.

As will be explained in greater detail, the purpose of bores 310 is toreceive and captively retain a portion of the restraint or support arm320 in order to hold the restraint arm 320 above the exercise platform122 at different predetermined angular positions relative to the planeof base 24. It will thus be appreciated that the particular arrangementof the bores 310 along the panel 212 corresponds to specific,predetermined angular settings for the restraint arm 320. By virtue ofthe number of bores 310 provided, a user is afforded the opportunity tomove the restraint arm 320 to a plurality of positions thereby allowingdifferent joint angles to be isolated and different exercises to beperformed or different muscle groups to be worked.

While the provision of eleven bores is generally preferred, in otherembodiments, the panel 212 could be provided with more or less boresdepending on the needs of the user. Similarly, the bores could bedisposed differently than in the preferred embodiment. For example, theradial spacing between adjacent bores could be varied (i.e. increased ordecreased).

Referring now to FIGS. 1, 4 a, 4 b, 9 and 10, the support or restraintarm assembly 330 is now described in greater detail. The restraint armassembly 330 includes a swing arm 332 pivotable relative to the base 24,the restraint or support arm 320 carried by the swing arm 332 and anindexing assembly 334 for setting the angular position of the swing arm332 (and restraint arm 320) relative to the plane of the base 24.

In this embodiment, the swing arm 332 is an elongate rod 336 having afirst end 338 pivotally connected to the base 24 and a second opposedend 340 attached to the restraint arm 320. The pivot connection betweenthe swing arm 332 and the base 24 is formed by a pivot pin 342 having aknob 344 at one end and threading at the other. The pivot pin 342extends through an aperture (not shown) defined in the first end 338 andis received in a threaded blind bore (not shown) formed in the outeredge 64 of the second long side 38 roughly midway between corners 42 and46.

Defined in the rod 336 at a location closer to the first end 338 than tothe second end 340, is a keyhole 346. As shown in FIG. 4b , the keyhole346 includes a centrally disposed, circular opening 348 provided with arectangular slot 350, 352 positioned on either side of, and openingonto, the circular opening 348. As explained below, the keyhole 346co-operates with an indexing member or key 354 and other portions of theindexing assembly 334 to secure the swing arm 332 in one of a pluralityof predetermined angular positions.

The indexing assembly 334 includes an indexing plate 360 attached to thebase 24 and an indexing pin or key 362 engageable with at least aportion of the indexing plate 360. The indexing plate 360 issubstantially semi-circular, its shape being defined by an arcuate edge364 with two opposed ends and a straight edge 366 extending between thetwo ends of the arcuate edge 364. Extending from the straight edge 366in the plane of the indexing plate 348, are two spaced apart mountingtabs 368 and 370; each provided with a laterally extending finger-likeprojection 372. The mounting tabs 368 and 370 are designed to be snuglyreceived within corresponding recesses 371 and 373 formed within theouter edge 64 of the second long side 38 (shown in FIG. 24), for a snapfit. The finger-like projections 372 serve to locate the mounting tabs368 and 370 within the recesses. The gap that exists between themounting tabs 368 and 370 provides clearance for the pivot connectionbetween the first end 338 and the base 24. When attached to the base 24with mounting tabs 368 and 370, the indexing plate 360 stands upright orproud of the base 24, its straight edge 366 abutting the top face 28 ofthe base 24.

The indexing plate 360 is further provided with a plurality of keyholesgenerically identified with reference numeral 374. The number ofkeyholes 374 corresponds to the number of blind bores 310 defined in thepanel 212. In the embodiment shown in FIG. 4a , the plurality ofkeyholes 374 includes eleven keyholes—keyholes 374 a, 374 b, 374 c, 374d, 374 e, 374 f, 374 g, 374 h, 374 i, 374 j and 374 k—which are disposedacross the indexing plate 360 in a semi-circular arrangementcorresponding to that of blind bores 310 a, 310 b, 310 c, 310 d, 310 e,310 f, 310 g, 310 h, 310 i, 310 j and 310 k. Accordingly, much likeblind bores 310 a to 310 k, the keyholes 374 a to 374 k are eachradially displaced from the plane of the base 24 by angle θ_(a), θ_(b),θ_(c), θ_(d), θ_(e), θ_(f), θ_(g), θ_(h), θ_(i), θ_(j) and θ_(k),respectively.

Each keyhole 374 extends between the first face 376 (which is orientedaway from the panel 212) and the second face 378 (which is positionedopposite the first face 214 of the panel 212) and is configuredsimilarly to the keyhole 346 defined in the rod 336. In particular, eachkeyhole 374 also includes a centrally disposed, circular opening 380provided with a rectangular slot 382, 384 positioned on either side of,and opening onto, the circular opening 380 (see FIG. 10). Furthermore,in like fashion to keyhole 346, each keyhole 374 is adapted to receivetherethrough a portion of the indexing key 354.

Associated with each keyhole 374 is a stop member 386 for preventingrotation of the indexing key 354 when the indexing key 354 is insertedinto the keyhole 374 and pivoted to its locking position 388. In thisembodiment and as shown in FIG. 10, the stop member 386 takes the formof a relatively small, rectangular projection 390 extending from thesecond face 378 and disposed adjacent the circular opening 380. In otherembodiments, a stop for the indexing key could take an alternate form.For instance, instead of a projection, the stop could be defined by oneor more grooves or notches machined into the second face 378 of theindexing plate 360. The notch would be adapted to receive and retain aportion of the indexing key to prevent rotation thereof.

Referring now to FIG. 1, the indexing key 354 has a body 392 providedwith a bulbous grip or handle portion 394 at one end, a transverse keyportion 396 fixed at the opposite end and a cylindrical portion 398extending between the handle portion 394 and the key portion 396. Whenviewed from the side, the cylindrical portion 398 and the key portion396 have a generally T-shaped profile. The key portion 396 has a pair ofopposed locking tabs 400 and 402; each locking tab 400, 402 extendingaway from the juncture of the key portion 396 with the cylindricalportion 398. The cross-sectional area of the key portion 396 is sizedslightly smaller than the keyhole 310 defined in the rod 336 and thekeyholes 374 defined in the indexing plate 360 so as to allow insertionof the indexing key 354 through the rod and the indexing plate 360.

When the indexing key 354 is inserted into the keyhole 374 and pivotedto its locking position 388, the locking tabs 400 and 402 are misalignedwith the rectangular slots 382 and 384 thereby preventing the indexingkey 354 from being removed from the keyhole 374. Moreover, in thelocking position 388, one of the tabs 400 or 402 abuts the stop member386.

Referring now to FIGS. 12a to 12d , the restraint arm 320 has agenerally cylindrical body 410 having a first end 412 welded to thesecond end 340 of the swing arm 332 and a second end 414 disposedopposite the first face 214 of the panel 212. At a position intermediatethe first and second ends 412 and 414, a stubby handle 413 protrudesfrom the body 410. Tubular foam pads 415 and 417 extend along thecylindrical body 410 on either side of the handle 413 and providecushioning to the user during exercise.

Machined through the body 410 is a longitudinal bore 416 which partiallyaccommodates a retractable locking pin assembly 418. The locking pinassembly 418 includes a relatively thin, elongate rod or locking pin 420captively retained within the bore 416, but capable of limited movementalong the longitudinal axis of the bore 416, and a helical spring member422 wrapped loosely about the pin 420. The pin 420 extends through arelatively short bore 424 formed at the second end 340 of the swing arm332 and passes through the bore 416. The first end 426 of the pin 420extends beyond the edge of the swing arm 332 and terminates with arelatively small, first stop member 428. This stop member serves a dualfunction. It limits the longitudinal displacement of the pin 420 in thedirection of the panel 212 and also doubles as a pull for retracting thepin 420. Similarly, the second end 428 of the pin 420 protrudes beyondthe end 414 of the restraint arm 320 and terminates with a second stopmember 430. The second stop member 430 is sized generally larger thanthe first stop member 428, but is configured to fit into the blind bores310 defined in face 214 of the panel 212. The second stop member 430 isoperable to limit the longitudinal displacement of the pin 420 in thedirection moving away from the side panel 212.

The locking pin 420 is moveable between an engaged position 432 (shownin FIGS. 12a and 12b ) and a retracted or disengaged position 434 (shownin FIG. 12c and 12d ). When the locking pin 420 is in the engagedposition 432, the locking pin 420 is engaged with the panel 212, itssecond stop member 430 being received within the one of the blind bores310. The locking pin 420 is biased in the engaged position 432 by virtueof the helical spring member 422. When the locking pin 420 is in theretracted or disengaged position 434, the locking pin 420 is no longerin engagement with the panel 212 as its second stop member 430 is pulledout from the bore 310.

The typical mode of operation of the restraint arm assembly 330 and thelocking pin assembly 418 is now described in greater detail. FIG. 9shows the initial angular position of the swing arm 332 and restraintarm 320 in dashed lines and the final angular position of thesecomponents in full lines. As a first step, the swing arm 332 isdecoupled from the indexing plate 360 so that it is free to rotate aboutthe pivot pin 342. This is achieved by removing the indexing key 354from the keyhole 348 defined in the rod 336 and the keyhole 374 b formedin indexing plate 360. The user grasps the handle portion 394 of theindexing key 354 and rotates the body 392 until the locking tabs 400 and402 are aligned with the slots 350 and 352 of the keyhole 348 and theslots 382 and 384 of the keyhole 374 b. Thereafter, the indexing key 354is pulled out of the swing arm 332 and the indexing plate 360.

Next, the user releases the restraint arm 320 from engagement with thepanel 212 by pulling on the first stop member 428 to overcome thebiasing effect of the spring member 422. This urges the locking pin 420to move from its engaged position 432 to its disengaged position 434.With the locking pin 420 in the disengaged position 434, the swing arm332 and the restraint arm 320 are now free to pivot relative to the base24. While holding onto the first stop member 428 the user grasps thestubby handle 413 and uses it to direct the restraint arm 320 to theblind bore 310 f which corresponds to the desired final angularposition. The user then releases the first stop member 428 to cause thelocking pin 420 to return to its engaged position 432. With therestraint arm 320 locked in place, the swing arm 332 is now securedagainst rotation by inserting the key portion 396 of the indexing key354 through the aligned keyholes 348 and 374 f. The indexing key 354 isthen rotated until one of the locking tabs 400 and 402 abuts therectangular projection 390.

The isometric exercise apparatus 20 can be used with a plurality ofattachments or accessories for enhanced versatility and comfort.Examples of such attachments are the first arm restraint attachment 152shown in FIGS. 13a to 13d and the second arm restraint attachment 540shown in FIGS. 14a and 14b , the footpad 128 and the dual foot restraintaccessory 132. Of course, the apparatus 20 could be employed with otherattachments as well.

Referring now to FIGS. 13a, 13b and 13c , there is shown the first armrestraint attachment 152. The attachment 152 includes the connector arm154 for attaching the arm restraint attachment 152 to the base 24, agenerally U-shaped sleeve or retaining member 442 releasably connectedto the connector arm 154 and a locking key 444 for securing theretaining member 442 to the connector arm 154. In the preferredembodiment, the connector arm 154 is formed by a bar 446 having anupstanding socket member 448 integrally formed therewith. The bar 446has first end 450 adapted for insertion into a slot 150 and a second end452 which carries the socket member 448. Projecting outward from thelateral edges of the first end 450 are the locking pins 166 and 168which are designed to seat within locking recesses 180 (as shown in FIG.8c ). The first end view profile of the bar 446 is shaped to generallycorrespond to the shape of the slot 150. But to allow insertion of thefirst end 450 in to the slot 150, the cross-sectional area of the firstend 450 is slightly smaller than the slot 150.

The socket member 448 has an upper end 454 which is carried above thebar 446 and a lower end 456 which depends downwardly from the bar 446.Formed in the upper end 454 is a blind bore 458. The bore 458 defines afemale socket 460 for receiving the male connector pin 462 of theretaining member 442. Two indexing apertures 464 and 466 extend inwardlyfrom the outer face 472 of the socket member 448 and open onto thefemale socket 460. Each indexing apertures 464, 466 has a shapegenerally similar to the keyhole 374 in that each includes a centrallydisposed, circular opening 467 provided with a rectangular slot 468, 470positioned on either side of, and opening onto, the circular opening467. The indexing apertures 464 and 466 are sized to receive a portionof the locking key 444 inserted therethrough.

Referring specifically to FIG. 13c the U-shape retaining member 442includes a back portion 474 and two spaced apart arm portions 476 and478 which are joined to, and project upwardly from the back portion 474.In this embodiment, the space S₁ extending between the arms portions 476and 478 is sized to accommodate a portion of a user's arm. However, itwill be appreciated that in other embodiments, this space could beenlarged to accommodate a portion of user's leg. In such embodiments,the arm restraint attachment would in effect be transformed into a legrestraint attachment.

The inner horizontal face 480 of the back portion 474, the innervertical face 482 of the arm portion 476, the inner vertical face (notshown) of the arm portion 478 which bound the space S₁, are providedwith cushioning to enhance the user's comfort during exercise. Thecushioning could take the form of a memory foam sheathed in a durablecover, such as vinyl.

A generally rectangular rebate 481 is cut into the back portion 474 atthe juncture between the outer horizontal face 482 and the outervertical face 483. When the first arm restraint attachment 152 ismounted to the base 24 in proximity to one of the casters 66, 72 or 74(see for instance, arm restraint attachment 152 i shown in FIG. 3), therebate 481 serves to provide a clearance for accommodating the castor soas to prevent the castor from interfering with the positioning of theretaining member 442.

Projecting downwardly from the outer horizontal face 482 of the backportion 474 is the male connector pin 462. The connector pin 462 isgenerally cylindrical and has a proximal end 486 joined to the backportion 474 and a distal or free end 488 which can be inserted into thefemale socket 460. In the preferred embodiment, three indexing openings490, 492 and 494 are cut into the connector pin 462 at spaced apartlocations disposed between the proximal end 486 and the free end 488.The first indexing opening 490 is located closest to the proximal end486. The second indexing opening 492 is disposed further down theconnector pin 462, while the third indexing opening 494 is locatedfurthest from the proximal end 486 close to the free end 488. When themale connector pin 462 is inserted within the female socket 460, one ofthe indexing openings 490, 492 and 494 is alignable with one of theindexing apertures 464 and 466 defined in the socket member 460. Byinserting the locking key 444 through the aligned indexing opening andaperture the retaining member 442 can be secured to the connector arm154.

As best shown in FIG. 13c , the indexing openings 490, 492 and 494 arenot all aligned with each other along a common vertical axis—some areradially staggered from each other. More specifically, the first andthird indexing openings 490 and 494 are vertically aligned with eachother, but are radial staggered from the second opening 492 by an angleof 90 degrees.

This arrangement of indexing grooves 490, 492 and 494 serves a dualpurpose. First, it permits a slight adjustment of the height at whichthe retaining member 442 is carried above the bar 446 and second, itallows the retaining member 442 to adopt a different orientation. Byaligning the first indexing opening 490 with the first indexing aperture464 when inserting the male connector pin 462 into the female socketmember, the retaining member 442 is carried at its shortest height abovethe bar 446. However, it will be appreciated that the height of theretaining member 442 relative to the bar 446 can be increased byaligning the third indexing opening 494 with the first indexing aperture464. The ability to adjust the height of the retaining member 442 tendsto be very desirable because it further adds to the versatility of theapparatus 20. It may allow additional joint angles to be isolated andexercises to be performed at different angles for the recruitment ofdifferent muscles. Additionally, it may permit the apparatus 20 to bebetter adapted for the specific body of a user.

In FIG. 13a the retaining member 442 of the arm restraint attachment 152is shown oriented with the space S₁ defined between opposing arms 476and 478 being generally parallel to the longitudinal axis of the bar446. The retaining member 500 of the accessory shown mounted in slot 150c (see FIG. 1) has a different orientation. More specifically, the spaceS extends generally perpendicular to the longitudinal axis of the bar446. This perpendicular orientation is achieved by aligning the secondindexing opening 492 with the first or second indexing apertures 464 and466. Again, by altering the orientation of the retaining member 442multiple variations of exercises become possible, thereby furtherenhancing the versatility of the isometric exercise apparatus 20.

Referring to FIG. 13d , the locking key 444 is configured generallysimilar to the indexing key 354 in that it a handle portion 504 at oneend, a transverse key portion 506 fixed at the opposite end and acylindrical portion 508 extending between the handle portion 504 and thekey portion 506. When viewed from the side, the cylindrical portion 508and the key portion 506 have a generally T-shaped profile. The keyportion 506 has a pair of opposed locking tabs 510 and 512; each lockingtab 510, 512 extending away from the juncture of the key portion 506with the cylindrical portion 508. The cross-sectional area of the keyportion 506 is sized slightly smaller than the indexing apertures 464and 466 defined in the socket member 460 and the indexing openings 490,492 and 494 formed in the connector pin 462 so as to allow insertion ofthe locking key 444 through the socket member 468 and the connector pin462. When the locking key 444 is inserted through the indexing apertureand the indexing opening and is pivoted, its the locking tabs 510 and512 are misaligned with the rectangular slots 468 and 470 therebypreventing the locking key 444 from being removed from the indexingaperture and indexing opening.

Referring to FIG. 13e , there is shown an alternate retaining member 520which may be used with the connector arm 154 and the locking key 444.The retaining member 520 has a structure that generally resembles thatof retaining member 442 in that the retaining member 520 is alsoprovided with a back portion 522, two spaced apart arm portions 524 and526 which are joined to, and project upwardly from the back portion 474and a space S₂ which extends between the arms portions 524 and 526.However, in this embodiment the space S₂ is bound by the horizontalinner face 528 of arm portion 524, the vertical inner face 530 of theback portion 522 and the horizontal inner face (not visible) of the armportion 526. Also, in contrast to the retaining member 442 which isgenerally U-shaped, the shape of the retaining member 520 is more likethat of a “C”. Instead of having a male connector pin extendingdownwardly from the horizontal outer face of the back portion like inthe retaining member 442, the male connector pin 532 of retaining member520 extends downwardly from the horizontal outer face 534 the armportion 524. The male connector pin 532 is configured for insertion intothe socket 460 of the connector arm 154 and is adapted to interact withthe locking key 444 in much the same manner as the male connector pin462 shown in FIG. 14b , such that no additional description is required.

The provision of C-shaped retaining member 520 is advantageous andenhances the versatility of the apparatus 20 in that it allows the userto perform isometric exercises that include a vertical force vector. TheC-shaped retaining member 520 and more specifically the arm portion 526thereof, acts as a restraint against a portion of the user's arm duringthe performance of such isometric exercises.

Referring now to FIGS. 14a and 14b , there is shown a second armrestraint attachment 540 according to another embodiment of the presentinvention. The attachment 540 is generally similar to the attachment 152in that it too includes a connector arm 541 for attaching the armrestraint attachment 540 to the base 24, a generally U-shaped sleeve orretaining member 542 releasably connected to the connector arm 541 and alocking key 544 for securing the retaining member 542 to the connectorarm 541.

In like fashion to the connector arm 154, the connector arm 541 isformed by a bar 546 having an upstanding socket member 548 integrallyformed therewith. The bar 546 has first end 550 adapted for insertioninto a slot 150 and a second end 552 which carries the socket member548. Projecting outward from the lateral edges of the first end 550 arethe locking pins 551 and 553 (seen on FIG. 14a ) which are generallysimilar to locking pins 166 and 168 and which are designed to seatwithin locking recesses 180. The first end view profile of the bar 546is shaped to generally correspond to the shape of the slot 150. But toallow insertion of the first end 550 in to the slot 150, thecross-sectional area of the first end 550 is slightly smaller than theslot 150.

The socket member 548 is generally similar to the socket member 448 inthat it too has an upper end 554 which is carried above the bar 546 anda lower end 556 which depends downwardly from the bar 546. Formed in theupper end 554 is a blind bore 558. The bore 558 defines a female socket560 for receiving the male connector pin 562 of the retaining member542. However, in contrast to the socket member 448 which has only twoindexing apertures 466 and 468, the socket member 548 has four indexingapertures 564, 566, 568 and 570 which extend inwardly from the outerface 572 of the socket member 548 and open onto the female socket 560.Moreover, instead of having a keyhole shape, the indexing apertures 464,466, 468 and 470 are generally rectangular and are sized to receive aportion of the locking key 444 inserted therethrough.

Referring specifically to FIG. 14b , the U-shape retaining member 542generally resembles the retaining member 442. The retaining member 542includes a back portion 574, two spaced apart arm portions 576 and 578which are joined to, and project upwardly from the back portion 474, anda space S₃ extending between the arms portions 476 and 478. The space S₃is bound by the inner face 580 of the back portion 574, the inner face582 of the arm portion 576, the inner face (not shown) of the armportion 578.

Projecting downwardly from the outer face 582 of the back portion 574 isthe male connector pin 562. The pin 562 is generally cylindrical and hasa proximal end 586 joined to the back portion 574 and a distal or freeend 588 which can be inserted into the female socket 560. However,instead of having indexing apertures open at both ends similar toindexing apertures 490, 492 and 444, the connector pin 562 in thisembodiment, has four indexing grooves or notches 590, 592, 594 and 596disposed at spaced apart locations between the proximal end 586 and thefree end 588. The first indexing groove 590 is located closest to theproximal end 586. The second indexing groove 592 is disposed furtherdown the connector pin 562, while the third indexing groove 594 islocated still further from the proximal end 586. Lastly, the fourthindexing groove is located furthest from the proximal end 586 close tothe free end 588. When the male connector pin 562 is inserted within thefemale socket 560, one or more of the indexing grooves 590, 592, 594 and596 is alignable with one or more of the indexing apertures 564, 566,568 and 570 defined in the socket member 560. By inserting the lockingkey 544 through the aligned indexing groove and aperture the retainingmember 542 can be secured to the connector arm 541.

As best shown in FIG. 14c , the indexing grooves 590, 592, 594 and 596are not all aligned with each other along a common vertical axis—someare radially staggered from each other. More specifically, the first andthird indexing grooves 590 and 594 are vertically aligned with eachother, but are radial staggered from the second and fourth grooves 592and 596 (which are also vertically aligned with each other) by an angleof 90 degrees.

This arrangement of indexing grooves 590, 592, 594 and 596 serves a dualpurpose. First, it permits adjustment of the height at which theretaining member 542 is carried above the bar 546 and second, it allowsthe retaining member 542 to adopt a different orientation. By aligningthe first indexing groove 590 with the first indexing aperture 564 wheninserting the male connector pin 562 into the female socket member, theretaining member 542 is carried at its shortest height above the bar546. However, it will be appreciated that the height of the retainingmember 542 relative to the bar 546 can be increased by aligning thethird indexing groove 594 with the first indexing aperture 564.

In FIG. 14a the retaining member 542 of the second arm restraintattachment 520 is shown oriented with the space S₃ defined betweenopposing arms 576 and 578 being generally parallel to the longitudinalaxis of the bar 546. However, the retaining member 542 may be orienteddifferently to allow the space S₃ to extend generally perpendicular tothe longitudinal axis of the bar 546. This perpendicular orientationwould be achieved by aligning the second indexing groove 592 with thefirst or second indexing apertures 564 and 566, or by aligning thefourth indexing groove 596 with any of one of the indexing apertures564, 566, 568 and 570. Again, by altering the orientation of theretaining member 542 multiple variations of exercises become possible,thereby further enhancing the versatility of the isometric exerciseapparatus 20.

Referring back to FIG. 14a , the locking pin 544 is shown to have agenerally rectangular portion 597 which serves as a knob to facilitategrasping of the locking pin and an engagement portion 599. Theengagement portion 599 is adapted to fit into the indexing apertures464, 466, 468 and 470 and the indexing groove 590, 592, 594 and 596.

FIG. 15 shows the footpad 128. The footpad 128 has a generally elongatebody 650 provided with a rigid plate 652. The rigid plate 652 is toppedby a foam pad 654 sheathed in a protective cover. While in thisembodiment, the foam pad 654 has a semi-circular profile, this need notbe the case in every application. In alternative embodiments, the foampad or for that matter, the entire footpad could be configureddifferently.

Extending from the bottom face 656 of the rigid plate 652 is a threadedconnector 658 which is used to secure the footpad 128 to the base 24.More specifically, when mounting the footpad 128 to the base 24, thethreaded connector 658 is inserted through the aperture 126 defined inthe exercise platform 122 and into the threaded blind bore formed in thetop face 28 of the base 24 (see FIG. 24) where it is fastened.Preferably, when attached to the base 24, the elongate body 650 of thefootpad 128 is oriented generally parallel to the short sides 28 and 32of the base 24 (as best shown in FIG. 4).

With reference to FIGS. 6 and 16, the dual foot restraint accessory 132is now described in greater detail. The dual foot restraint accessory132 has a dual arch structure 660 defined by a three spaced apartvertical members 662, 664 and 666. The second vertical member 664 isdisposed between the first and third vertical members 662 and 666.Joining the first vertical member 662 to the second vertical member 664at their respective top ends is a first arch member 668. Similarly, asecond arch member 670 spans the space between the second and thirdvertical members 664 and 666 to connect their respective top ends toeach other. A threaded connector 672 extending from the bottom end 674of the second vertical member 662, is used to secure the accessory 132to the base 24. In like fashion to threaded connector 658 of footpad128, the threaded connector 672 is configured for insertion through theaperture 126 defined in the exercise platform 122 and into the threadedblind bore formed in the top face 28 of the base 24.

As best shown in FIG. 6, when mounted onto the base 24, the dual archstructure 660 is oriented generally parallel to the short sides 28 and32 of the base 24. The dual arch structure 660 in cooperation with theexercise platform 122 define a pair of apertures 676 and 678 throughwhich a user can insert their feet.

The dual arch structure 660 can be fabricated of hard plastic or metal,but preferably it is coated with a resilient material such as rubber toenhance the comfort of the user. It should be appreciated that in otherembodiments, the dual foot restraint accessory could be configureddifferently. For instance, in an alternative embodiment, the dual footrestraint accessory could replace the dual arch structure with a pair offoot straps connected to each other.

Exemplary uses of the isometric exercise apparatus 20 are now describedwith reference to FIGS. 17 to 24. FIG. 17 shows a user identifiedgenerally with reference numeral 680, using the footpad 128 to performan exercise to work the user's calf (gastrocnemius) muscle. As apreliminary matter, the user 680 ensures that the swing arm 332 is movedto its fully vertical position. Alternatively, to provide increasedclearance to the user 680, the restraint arm assembly 330 could bedetached from the frame 22 as described below. The user 680 then liesdown on the base 24 with his back supported on the exercise platform122. His head 684 is positioned proximate the outer edge 48 of firstshort side 32, while the remainder of his body extends toward theopposed second short side 34. The user's hip (not visible) and knees 686are flexed to approximately 45 degrees. The user's feet 688 are disposedbetween the outer edge 48 and the footpad 128 with his heels 690 restingagainst the pad 654 of the footpad 128. Once in position, the userattempts to pull his heels 690 towards his buttocks (not visible) withthe pad 654 acting as a restraint for his heels 690, thereby causing thecalf muscles in his legs 692 to isometrically contract. The user mayhold this position for a number of seconds, and repeat as desired. Thisexercise may be performed one leg at a time and may be performed withthe foot (or feet) internally or externally rotated.

FIG. 18 shows the user 680 using the horizontal restraint member 320 ofthe restraint arm assembly 330 to perform an isometric exercise to workcertain of the user's hip flexor muscles. As a preliminary matter, theuser 680 adjusts the restraint arm assembly 330 so that the restraintarm 320 is carried above the exercise platform 122 at a first angularposition defined by the angle θ_(a) (see FIG. 4a ). The user 680 thenlies down on the base 24 with his back supported on the exerciseplatform 122. His head 684 is positioned proximate the outer edge 48 offirst short side 32, while the remainder of his body extends toward theopposed second short side 34. The user's legs 692 extend between therestraint arm 320 and the exercise platform 122. The user 680 raises hislegs 692 by flexing his hips (not visible) while keeping his knees (notvisible) straight, and brings a portion of each leg 692 above the ankle694 to bear against the foam pads 415 and 417 of the restraint arm 320.Once in position, the user 680 attempts to further raise his legs 692against the restraint action of the restraint arm 320, thereby causingthe rectus femoris or hip flexor muscles in his legs 692 toisometrically contract. The user may hold this position for a number ofseconds, and repeat as desired. This exercise may be performed one legat a time and may be performed with the leg or legs internally rotated.

FIG. 19 shows the user using the horizontal restraint member 320 of therestraint arm assembly 330 to perform an isometric exercise to work thecertain of the user's abdominal muscles and more specifically, thetransverse abdominis muscles. As a preliminary matter, the user 680adjusts the restraint arm assembly 330 so that the restraint arm 320 iscarried above the exercise platform 122 at an angular position definedby the angle θ_(k) (see FIG. 4a ). The user 680 sits on the platform 122and raises his torso until his chest 696 makes contact with therestraint arm 320. Thereafter, the user pulls his chest 696 or uppertorso into the arm 320 against the restraint of the arm 320 therebycausing his abdominal muscles to contract isometrically. The user mayhold this position for a number of seconds, and repeat as desired.

FIG. 20 shows the user 680 using the horizontal restraint member 320 ofthe restraint arm assembly 330 to perform an isometric exercise to workthe user's back muscles, more specifically, the latissimus dorsimuscles, and the triceps brachii muscles located in the upper arm. As apreliminary matter, the user 680 ensures that the swing arm 332 is movedto its fully vertical position. The user sits up on the platform 122with his legs 692 substantially perpendicular to his back 700 and hisarms 702 outstretched in front of him extending generally parallel tohis legs 692. The user is positioned on the platform in such a way as toallow the user to grasp the foam pads 415 and 417 of the restraint arm320. With his palms facing down, the user then pulls on the restraintarm 320 in a downward direction to thereby cause the isometriccontraction of the user's latissimus dorsi muscles and triceps brachiimuscles. The user may hold this position for a number of seconds, andrepeat as desired.

FIG. 21 shows the user 680 using the arm restraint attachment 152 i toperform an isometric exercise to work the user's rhomboid muscles (themuscles located between the shoulder blades). As a preliminary matter,the user 680 ensures that the swing arm 332 is moved to its fullyvertical position. Alternatively, to provide increased clearance to theuser 680, the restraint arm assembly 330 could be detached from theframe 22 as described below. The user 680 then lies down on the base 24with his back supported on the exercise platform 122. His head 684 ispositioned proximate the outer edge 48 of first short side 32, while theremainder of his body extends toward the opposed second short side 34.The user places his arm 704 (and more specifically, his forearm 706)into the space S₁ defined in U-shaped retaining member 442. Once inposition, the user pulls his arm towards his body and against therestraint created by the arm portion 476 of the retaining member 442thereby urging the user's rhomboid muscle to isometrically contract. Theuser may hold this position for a number of seconds, and repeat asdesired. In FIG. 21, the user 680 is shown performing this exercise withhis arm externally rotated. It will be appreciated that this exercisecould also be performed with the arm internally rotated or with the palmof the hand turned to face the body of the user.

FIG. 22 shows the user 680 using the sidewall 26 to perform an isometricexercise to work one of the user's hip flexor muscles and morespecifically, the tensor fascia lata muscle. To get into position, theuser 680 stands on the platform 122 facing the second short side 34 withhis heels 690 adjacent the first short side 32 and his legs 692 spreadapproximately shoulder width apart. Once in position, the user 680abducts his right leg 692 a approximately 20 degrees (that is, the usermoves his right leg 692 a away from the left leg 692 b) so that theblade of his foot 708 comes to bear against the arc-shaped pad 304. Theuser 680 pulls his foot 708 into the pad 304 against the restraintcreated by the sidewall 26 thereby urging the user's tensor fascia latamuscle to isometrically contract. The user may hold this position for anumber of seconds, and repeat as desired. The user may perform the sameexercise for his left leg by positioning himself on the opposite shortside 34.

FIG. 23 shows the user 680 using the dual foot restraint attachment 132to perform an isometric exercise to work one of the user's lower legmuscles and more specifically, the popliteus muscle located behind theknee. As a preliminary matter, the user 680 ensures that the swing arm332 is moved to its fully vertical position. Alternatively, to provideincreased clearance to the user 680, the restraint arm assembly 330could be detached from the frame 22 as described below. The user 680then lies down on the base 24 with his back supported on the exerciseplatform 122. His head 684 is positioned proximate the outer edge 48 offirst short side 32, while the remainder of his body extends toward theopposed second short side 34. Alternatively, the user 680 can sit up onthe platform 122 with his back generally perpendicular to his legs 692.The user then inserts his right foot 708 a into the aperture 678 and hisleft foot 708 b into the aperture 676. Once in position, the userrotates his lower legs inwardly and pulls each of the right foot 692 aand left foot 692 b into the vertical member 664 of the dual archstructure 660. In this case, the vertical member 664 acts as therestraint against which the user is acting which urges the popliteusmuscles in the user's lower legs to isometrically contract. The user mayhold this position for a number of seconds, and repeat as desired. Thisexercise may be performed one leg at a time and may be performed withthe lower leg or legs externally rotated. When performed with the lowerlegs rotated externally, the feet 692 and 692 b would be urged to pullagainst the vertical members 662 and 666 of the dual arch structure 660.

The examples described above are not intended to be exhaustive orlimiting in any way and are merely provided to illustrate only some ofthe possible ways in which the isometric exercise apparatus 20 may beused.

Once the user has completed performing exercises on the isometricexercise apparatus 20, the frame 22 of the apparatus 20 could becollapsed to facilitate storage of the apparatus 20. The procedure formoving the apparatus 20 from its in-use position 253 to its out-useposition 251 is now described with reference to FIGS. 24, 25 and 26. Asan initial step, the pads 304 and 306, the swing assembly 330 and allthe attachments (i.e. the footpad 128, the arm restraint attachments152, and any others) are detached from the isometric exercise apparatus20. More specifically, sufficient force is applied to the pads 304 and306 to overcome the magnetic forces which retain the pads 304 and 306 onthe panel 212.

Next the swing assembly 330 is partially disassembled. The indexing key354 is disengaged the from the indexing plate 360 and the rod 336 byrotating the indexing key 354 until it tabs 400 and 402 are aligned withthe slots 382 and 384 of the indexing aperture 374 defined in theindexing plate 360 and the slots 350 and 352 of the keyhole 346 definedin the rod 336 and then pulling out the indexing key 354. The pivot pin342 is then unfastened from the base 24 and the locking pin 420 of therestraint arm 320 is moved to its retracted or disengaged position 434,thereby releasing the swing arm 332 from the frame 22.

Subsequently, the threaded connector 658 of the footpad 128 isunfastened from the base 24. If the dual foot restraint 660 is mountedon the apparatus 20, it can be detached by unfastening its threadedconnector 672. To detach the arm restraint accessory 152 from the base,the connector arm 154 is pulled outwardly and upwardly to release thelocking pins 166 and 168 from the locking recesses 180. With lockingpins released, the connector arm 154 can be pulled out of the slot 150.

The order of removal described above was provided as an example only. Itis not intended to be limiting. In other embodiments, the order ofremoval for the accessories could be modified. For instance, the armrestraint accessories could be removed first, followed by the foot padand culminating with the arc-shaped pads.

Next, the lock bars 254 and 256 are removed from the frame 22 byremoving the locking pins 303 and sliding the first and second flangeportions 268 and 274 of each lock bar 254, 256 out from their respectivestations 276 a, 276 b or 278 a, 278 b (as the case may be) (see FIG.25). The sidewall 26 is then be pivoted about the hinge rod 146 andbrought to its collapsed position 250. With sidewall 26 bearing againstthe base 24, the frame 22 is now collapsed and the apparatus 20 is inits out-of-use storage position 253 as shown in FIG. 26. When in itsout-of-use storage position 253, the apparatus 20 is portable and can berelatively easily carried or transported. In this embodiment, whencollapsed the frame 22 bereft of any attachments or accessories weighsapproximately 45 lbs. However, in other embodiments, the frame may weighless or more depending on the intended usage of the apparatus andwhether the portability of the apparatus is a factor to be affordedgreater or lesser importance for this intended usage.

Referring now to FIGS. 28, 29 and 32, there is shown a storage rack 80which is configured to hold one or more isometric exercise apparatus 20in the out-of-use, storage position 253. The rack 80 has a frame 802which includes a base 804 and a support structure 806 carried on thebase 804. The base 804 has a pair of spaced apart structural sidemembers 808 and 810 which are joined to each other by a relatively thin,tie member 812 and a more substantial cross member 814.

Each structural side member 808, 810 extends between a first end 816 andan opposed second end 818. Formed in each structural side member 808,810 starting at the first end 816 and extending toward the second end818, is an elongate channel 820. However, the channel 820 does notextend all the way to the second end 818. At a location closer to thesecond end 818 than to the first end 816, the channel 820 is closed offby an abutment face 822. As will be explained in greater detail below,the elongate channel 820 acts a guide means for directing and retainingthe castors 72 and 74 of the apparatus 20, as the apparatus 20 is placedon the storage rack 800. A tapered throat 822 (widest at the outermostedge and narrowing in the direction of the second end 818) providesaccess to the channel 820 and tends to facilitate insertion of thecastors 72 and 74 into the channel 820. As best shown in FIG. 32, thechannel 820 itself is defined by a back portion 824 and a pair of spacedapart legs 826 and 828 which are joined to, and stand proud of, the backportion 824.

The tie member 812 is mounted to the first and second structural sidemembers 808 and 810 at locations closer to the first ends 816 than tothe second ends 818 thereof. In this embodiment, the tie member 812 isprovided with front and rear flange portions 830 at either end forplacement against the inner vertical faces 831 of the structural sidemembers 808 and 810. Fasteners 832 attach the flange portions 830 to thestructural side members 808 and 810. In an alternative embodiment, thetie member 812 could be secured to the structural side member 808 and810 by welding.

The cross-member 814 is disposed between the structural side members 808and 810 adjacent the second ends 818 thereof. The cross-member 814 hasat each end a pair of front and rear flange portions or tabs 834. Inlike fashion to the flange portions 830, the flange portions 834 areplaced against the inner vertical faces 831 of the structural sidemembers 808 and 810 and secured in place by fasteners 836.

The support structure 806 includes a pair of spaced apart, first andsecond, tubular support arms 82 and 84 and a transverse reinforcementmember 844 connecting the support arms 82 and 84 to each other. Thereinforcement member 844 is attached to the support arms 82 and 84 byfasteners 845. However, in other embodiments, the reinforcement membercould be welded to the support arms.

Each support arm 82, 84 has a proximal end 844 provided with a circularflange portion 846 and a distal or free end 848. The circular flangeportion 846 abuts the top face 850 of the cross-member 814 and issecured in place by fasteners 852. In other embodiments, the supportarms could be welded to the base. Each support arm 82, 84 furtherincludes a first vertically extending portion 854 which runs from thefirst end 844 to a transition zone or bend 856, and a secondhorizontally extending portion 858 which runs from the bend 856 to thefree end 846. The reinforcement member 844 is secured to the firstvertically extending portions 854 at a location closer to the bend 856than to the first end 844.

As best shown in FIG. 29, the second horizontally extending portion 854extends perpendicular to the first vertically extending portion 854 andruns parallel to the structural side members 808 and 810 and in thedirection of the first ends 816 thereof. The second horizontallyextending portion 854 is carried above the base 804 at a heightsufficient to accommodate the width W₁ of base 24. The diameter of eachsecond horizontally extending portion 854 is sized slightly smaller thanthe first and second bores 76 and 78 defined in the base 24 of theisometric exercise apparatus 20.

A pair of aligned bores 862 are defined in the second horizontallyextending portion 854 adjacent the free end 846. The bores 862 areconfigured to accommodate a generally T-shaped locking pin 864.

Placement of the apparatus 20 onto the storage rack 80 is now describedin greater detail with reference to FIGS. 30 and 31. As a preliminarystep, the locking pins 864 are disengaged from the support arms 80 and82. Then grasping the handles 56 and 60, the user lifts the apparatus 20and aligns the bores 76 and 78 with the second horizontally extendingportions 858 and ensures that the castors 72 and 74 are in alignmentwith the channels 820 of the structural side members 808 and 810. Thesecond horizontally extending portions 858 are then inserted into thebores 76 and 78, and the apparatus 20 (now suspended from the supportarms 82 and 84) is urged to travel toward the rear of the support rack80 (i.e. toward the vertically extending portions 854). The displacementof the apparatus 20 along the support arms 82 and 84 is guided in partby the engagement of the castors 72 and 74 within the channels 820.Adjacent the bend 856, further movement of the apparatus 20 along thesupport arms 82 and 84 is arrested by the vertically extending portions854 and the abutment faces 822 of the structural side members 808 and810. To ensure, the stowed apparatus 20 does not accidentally disengagefrom the support rack 80, the locking pins 864 are put in place.

In FIG. 31, the support rack 80 is shown holding two isometric exerciseapparatuses 20 a and 20 b. But, the support rack 80 of this embodimentis configured to hold ten isometric exercise apparatus placed one afterthe other. This need not be the case in every application. In otherembodiments, the support rack may be configured to hold a greater orlesser number of apparatus. If the apparatus 20 is destined for homeuse, the support rack may be configured to hold a single unit.

Referring to FIGS. 33 to 35, there is shown an alternate isometricexercise apparatus generally designated with reference numeral 900. Theapparatus 900 is generally similar to apparatus 20 in both structure andfunctionality. Like the apparatus 20, the apparatus 900 possesses aframe 902 which includes a base 904 and a sidewall 906 hingedlyconnected to the base 24 along a portion thereof. However, the hingeconnection used in apparatus 900 is different than that used inapparatus 20. Similarly, much like the base 24 of apparatus 20, the base904 is configured to receive motion restraint attachments oraccessories. However, the manner in which some of these accessories orattachments are attached to the base 904 differs from that used tosecure similar attachments to the base 24. These design modificationsare described in greater detail below.

The base 904 includes a substantially rectangular panel 908 providedwith a top face 910 (see FIG. 34) and an opposed bottom face 912 (seeFIG. 35). As best shown in FIG. 35, the shape of the panel 908 isdefined by a pair of opposed, relatively short first and second sides914 and 916, and a pair of opposed, relatively long, first and secondsides 918 and 920 extending between the short sides 914 and 916. Thefirst short side 914 meets the first long side 918 at a first radiusedcorner 922, and joins the second long side 916 at a second radiusedcorner 924. The two remaining corners of the panel 908—third and fourthradiused corners 926 and 928—are formed by the juncture of the secondshort side 920 and each of the first and second long sides 918 and 920,respectively. At a location approximately four-fifths of the way betweenthe first and second long sides 918 and 920 proximate the first andthird corners 926 and 928, the outer edges 930 and 932 of the first andsecond short sides 914 and 916 come in a short distance toward eachother to define shoulder portions 934 and 936. Beyond the shoulderportions 934 and 936, the outer edges 930 and 932 are parallel to eachother as they extend toward their respective corners 922 and 926.

In like fashion to the panel 27, the panel 908 is also provided withfirst and second handles 940 and 942 which are generally similar instructure and location to the handles 58 and 60 defined in the panel 27and castors 944, 946, 948 and 950 which correspond generally to castors66, 68, 72 and 74, respectively. Bores 952 and 954 resembling bores 76and 78 in size and location are defined in the panel 27. The isometricexercise apparatus 900 can be hung onto the support arms 82 and 84 ofthe rack 80 from the bores 952 and 954.

As shown in FIG. 35, the bottom face 912 is provided with severalgrip-enhancing bands or strips 960, 962, 964 and 966. These bands aregenerally similar in shape to bands 90, 92, 94 and 96 and are disposedon the bottom face 912 in a similar arrangement to that shown in FIG. 7.

Referring now to FIGS. 33 and 34, the top face 28 has a rectangularstation 970 formed therein. The boundaries of the station 970 aredelimited by a frame 972 having margins 974, 976, 978 and 980. Eachmargin 974, 976, 978 extends outwardly toward a corresponding outer edge930, 932, 982, respectively. Secured within the station 970 is anexercise platform 984 which supports the user's body while he/she isperforming exercises using the isometric exercise apparatus 900. Theexercise platform 984 is similar to the exercise platform 122 shown inFIG. 3 in all other respects.

In contrast to the panel 27 shown in FIG. 2, the panel 908 depicted inFIG. 33 does not have any hinge tubes. As explained in greater detailbelow, in this alternate embodiment, the hinge connection is formed withfour hinge assemblies 1020, 1022, 1024 and 1026.

Referring now to FIGS. 33 and 35, a plurality of slots genericallyidentified with reference numeral 990 extends from the outer edges 930,932 and 982 into the panel 908 and toward the station 970. As will beexplained in greater detail below, the slots 990 are adapted to receivea connector arm of an accessory of the isometric exercise apparatus 900(as shown in FIG. 37). The slots 990 include twelve slots 990 a, 990 b,990 c, 990 d, 990 e, 990 f, 990 g, 990 h, 990 i, 990 j, 990 k and 990 l,disposed at different locations along the sides 914, 916 and 918 andhaving different orientations relative to their corresponding outeredges 930, 932 and 982. The relative position and orientation of eachslot 990 a, 990 b. 990 c, 990 d, 990 e, 990 f, 990 g, 990 h, 990 i, 990j, 990 k, 990 l substantially matches that of each corresponding slot150 a, 150 b, 150 c, 150 d, 150 e, 150 f, 150 g, 150 h, 150 i, 150 j,150 k and 150 l shown in FIG. 7.

But for differences arising from their varying orientations, the slots990 all have a generally similar structure, such that a description ofone representative slot—slot 990 d—will suffice for the others.Referring now to FIG. 36, slot 990 d is generally similar to slot 150 iin that it too has a tapered throat 992 (widest at the outer edge 930and narrowing in the direction of the slot) which tends to serve as aguide for locating the connector arm 994 of the arm restraint attachment996 d into the slot 990 d. The throat 992 opens onto a relatively largecentral opening 998 whose profile is generally oblong. However, incontrast to the slot 150 i, the slot 990 d is not bounded on either sideby C-shaped channels and is not configured with any locking recesses.

Disposed along the margins 974, 976 and 978 at locations correspondingto each slot 990, are a plurality of circular rebates genericallyidentified with reference numeral 986 that are defined into the top face910 of the panel 908. More specifically, there are twelve rebates 986 a,986 b, 986 c, 986 d, 986 e, 986 f, 986 g, 986 h, 986 i, 986 j, 986 k and986 l. At the center of each rebate 986 is an aperture 988 which opensonto an associated slot 990. As explained in greater detail below, eachaperture 988 is sized to receive a locking pin 999 to secure theconnecting arm 994 of an arm restraint attachment 996 into a slot 990.

Referring now to FIG. 33, the sidewall 906 is now described in greaterdetail. The sidewall 906 is generally similar to sidewall 26 in that italso includes a substantially rectangular panel 1000 provided with afirst face 1002 (see FIG. 33) and an opposed second face (not shown).The shape of the panel 1000 is defined by a pair of opposed, relativelyshort first and second sides 1002 and 1004, and a pair of opposed,relatively long, first and second sides 1006 and 1008 extending betweenthe short sides 1002 and 1004. The first short side 1002 meets the firstlong side 1006 at a first corner 1010, and joins the second long side1008 at a second corner 1012. The two remaining corners of the panel1000—third and fourth corners 1014 and 1016—are formed by the junctureof the second short side 1004 and each of the first and second longsides 1006 and 1008, respectively.

In contrast to panel 212 shown in FIG. 2, the panel 1000 depicted inFIG. 33 does not have any hinge knuckles welded to its outer edge.Instead, the panel 1000 of the sidewall 906 is hingedly connected to thepanel 908 of the base 904 with spaced apart, first, second, third andfourth hinge assemblies 1020, 1022, 1024 and 1026. The hinge assemblies1020, 1022, 1024 and 1026 are oriented generally parallel to the outeredges 982 and 998 and are disposed in the region which lies between themargin 980 and the outer edge 998. The second and third hinge assemblies1022 and 1024 are disposed between the first and fourth hinge assemblies1020 and 1026.

Referring now to FIG. 36, each hinge assembly 1020, 1022, 1024 and 1026includes a first hinge bracket 1030, a second hinge bracket 1032engageable with a portion of the first hinge bracket 1034, and a hingepin 1036 for securing engagement of the first hinge bracket 1032 to thesecond hinge bracket 1034. The first hinge bracket 1030 includes a baseplate 1036 and a pair of spaced mounting tabs 1038 standing proud of thebase plate 1036. The mounting tabs 1038 and the base plate 1036co-operate with each other to define a channel (not visible) which issized to receive therein a portion of the first long side 1006 of thepanel 1000. The first hinge bracket 1032 is secured to the panel 1000 bya pair of fasteners 1040 extending through each mounting tab 1038 andthe first and second faces of the panel 1000. Extending away from thebase plate 1036 opposite to the mounting tabs 1038, are a pair of spacedapart hinge knuckles 1042 and 1044. Each hinge knuckle 1042, 1044 has anaperture 1046 defined therein sized to receive a portion of the hingepin 1036.

The second hinge bracket 1034 includes a base plate 1050 and a singlehinge knuckle 1052 standing proud of the base plate 1050. The base plate1050 is secured to the top face 910 of the base panel 908 by fasteners1054. When first hinge bracket 1032 is engaged with the second hingebracket 1034, the hinge knuckle 1052 is positioned between the hingeknuckles 1042 and 1044 with the aperture (not shown) defined in thehinge knuckle 1052 aligned with the apertures 1046 defined in the hingeknuckles 1042 and 1044 and the hinge pin 1036 inserted therethrough.

Thus formed, the hinge connection between the base 904 and the sidewallallows the sidewall 906 to be moved between a collapsed position (notshown) and an upstanding position 1054 (shown in FIGS. 33 and 34). Theapparatus 900 of this embodiment employs a similar arrangement of sidelocking bars and receiving stations to those employed in apparatus 20 tomaintain the sidewall 906 in the upstanding position 1054. When thesidewall 906 is moved to its collapsed position the first face 1002 ofthe sidewall 906 is brought opposite the top face 910 of the base 904and the apparatus 900 is now in its out-of-use, storage position.

Except as set out above, the panel 1000 of the sidewall 906 is otherwiseconfigured similar to the panel 212 of the sidewall 27 is all respects.

Along the same vein, the apparatus 900 is provided with a support orrestraint arm assembly 1060 which is similar to the support arm assembly330 employed by the apparatus 20 in all respects including structure andfunctionality, such that no additional description is required.

Much like the apparatus 20, the apparatus 900 can be used with aplurality of attachments or accessories for enhanced versatility andcomfort. Examples of such attachments are the third arm restraintattachment 996 shown in FIGS. 38 and 39 and the fourth arm restraintattachment 1090 shown in FIGS. 40 and 41, the footpad 128 and the dualfoot restraint accessory 132. Of course, the apparatus 900 could beemployed with other attachments as well.

Referring now to FIG. 38, there is shown the third arm restraintattachment 996. The attachment 996 is generally similar to attachment152 in that it includes the connector arm 994 for attaching the armrestraint attachment 996 to the base 904, a sleeve or retaining member1062 releasably connected to the connector arm 994 and a locking key1064 similar to locking key 444 for securing the retaining member 1062to the connector arm 994. However, in contrast to the retaining member442 which is generally U-shaped, the retaining member 1062 in thisembodiment is generally C-shaped and resembles alternate retainingmember 520 shown in FIG. 13e in all respects. The connector pin 1063 ofthe retaining member 1062 is configured for insertion into the socketmember 1068 of the connector arm 994 and is adapted to interact with thelocking key 1064 in much the same manner as the male connector pin 462shown in FIG. 14b engages the socket 460 and interacts with locking key444, such that no additional description is required.

The connector arm 994 is generally similar to the connector arm 154 inthat it too is formed with a bar 1066 having upstanding socket member1068 integrally formed therewith. The bar 1066 has a first end 1070adapted for insertion into a slot 990 and a second end 1072 whichcarries the socket member 1068. However, unlike the bar 446, the bar1066 does not have any locking pins projecting from the lateral edges ofthe first end 1070. Additionally, adjacent the first end 1070, the bar1066 has three bores 1074, 1076 and 1078 extending between the top andbottom faces of the bar 1066. Except as described above, the connectorarm 994 is otherwise similar to the connector arm 154 in all respects,such that no additional description is required.

It will be appreciated by a person skilled in the art that theattachment 996 is attached to the base 904 in a different manner thanthat employed by the attachment 152 of the apparatus 20. With specificreference to FIG. 39, to secure the arm restraint attachment 996 to thebase 904, the first end 1070 of the connector arm 994 is inserted into aslot 990 and one of the bores 1074, 1076 and 1078 is aligned with theapertures 988 and 1080 defined in the base 904. Thereafter, a lockingpin 999 is inserted through the aligned bore 1074, 1076 or 1078 andapertures 988 and 1082 to thereby fix the attachment 996 in place.

The arm restraint attachment 1090 is now described with reference toFIGS. 40 and 41. The attachment 1090 includes a connector arm 1092, anextension rod 1094 releasably connected to the connector arm 1092, alocking key 1095 for securing the lower end 1096 of the extension rod1094 to the connector arm 1092, a retaining member 1098 releasablyconnected to the upper end 1100 of the extension rod 1094, and a lockingpin 1102 for securing the upper end 1100 of the extension rod 1094 tothe retaining member 1098. The connector arm 1092 is similar to theconnector arm 994 in all respects such that no further description isrequired.

Turning now to the extension rod 1094, it has a generally cylindricalbody 1104 that extends between the upper and lower ends 1100 and 1096.The lower end 1096 is configured similarly to the male connector pin 462shown in FIG. 13c in that it too is provided with three indexingopenings 1106, 1108 and 1110 cut into the body 1104 at spaced apartlocations. The first indexing opening 1106 is located closest to theupper end 1100. The second indexing opening 1108 is disposed relativelylower on the body 1104 than the opening 1106, while the third indexingopening 1110 is located furthest from the upper end 1098 close to thelower end extremity 1112. The indexing openings 1106, 1108 and 1110 arenot all aligned with each other along a common vertical axis—some areradially staggered from each other. More specifically, the first andthird indexing openings 1106 and 1110 are vertically aligned with eachother, but are radial staggered from the second opening 1108 by an angleof 90 degrees. The lower end 1096 is configured for insertion into thesocket 1114 and is adapted to interact with the locking key 1095 in muchthe same manner as the male connector pin 462 shown in FIG. 14b engagesthe socket 460 and interacts with locking key 444, such that noadditional description is required.

A short distance down from the upper end 1100, the body 1104 has a notchor groove 1120 defined therein. When the extension rod 1094 is insertedinto the blind bore 1122 of the retaining member 1098 (shown in FIG.41), the notch 1120 is alignable with an aperture 1124 defined in theback face 1126 of the retaining member 1098. To secure the retainingmember 1098 to the extension rod 1094, the locking pin 1102 is insertedthrough the aperture 1124 and engages the notch 1120.

In this embodiment, the extension rod 1094 measures approximately 12inches. In other embodiments, the length of the rod could be modified tosuit a particular application.

Referring to FIGS. 40 to 41, the retaining member 1098 is now describedin greater detail. The retaining member 1098 has a body 1130 defined byback face 1126, an opposed arcuate face 1132, a pair of lateral faces1134 extending between the back face 1126 and the arcuate face 1132, atop face 1136 and an opposed bottom face 1138. The back face 1126 isgenerally square and has a fingerprint-shaped rebate 1140 definedtherein at a location closer to the bottom face 1138 than to the topface 1136. The aperture 1124 is formed within the rebate 1140.Similarly, the bore 1122 is defined into the bottom face 1138.

The arcuate face 1132 defines a partial or open cuff 1142 which is sizedto receive a portion of user's arm. The cuff 1142 acts as a restraint toprevent movement of the user's arm during the performance of anisometric exercise. In particular, it may be used advantageously toresist or restrain movements that have vertical force components.Additionally, the provision of extension rod 1094 further enhances theversatility of the apparatus 900 by enabling the user to performisometric exercises that target different joint angles and muscles thanthose which would have otherwise been targeted using the arm restraintattachments 152, 540 and 996.

It should be appreciated that the extension rod 1094 and retainingmember 1098 could be used to equal advantage with the connector arm 154shown in FIG. 13 c.

FIG. 42 shows yet another arm restraint attachment designated generallywith reference numeral 1150. The attachment 1150 includes a connectorarm 1152, an extension rod 1154 releasably connected to the connectorarm 1152, a locking key 1156 for securing the lower end of the extensionrod 1154 to the connector arm 1152, a retaining member 1160 releasablyconnected to the upper end of the extension rod 1154, and a locking pin1164 for securing the upper end of the extension rod 1154 to theretaining member 1160. The connector arm 1152, the extension rod 1154and the locking key 1156 are similar to their counterpart elements 1092,1094, 1095 in all respects such that no further description is required.

Referring now to FIG. 43, the retaining member 1160 has a body 1170defined by a back wall 1172, a bottom wall 1174, an arcuate wall 1176joining the back wall 1172 and the bottom wall 1174, and a pair oflateral faces 1175 defined by edges of the back wall 1172, the bottomwall 1174 and the arcuate wall 1176. The back face 1172 is generallyrectangular and has a fingerprint-shaped rebate 1180 defined therein ata location closer to the bottom wall 1174 than to the juncture of theback wall 1172 and the arcuate wall 1176. An aperture 1182 is formedwithin the rebate 1180. Similarly, a bore (not visible) for receivingthe upper end of the extension rod 1154 is defined into the bottom wall1174.

The arcuate wall 1176 and the interior face 1186 cooperate with eachother to form a closed cuff 1188 which bounds a generally oval-shapedopening 1190. The opening 1190 is sized to receive a portion of theuser's arm. The cuff 1188 acts as a restraint to prevent movement of theuser's arm during the performance of an isometric exercise. Inparticular, it may be used advantageously to resist or restrainmovements that have vertical force components. For enhanced versatility,the oval opening 1190 is oriented with its long axis 1192 disposed at anangle of 45 degrees from the vertical axis V-V. It will be appreciatedthat in other embodiments, the orientation of the opening could bemodified to suit a particular application. In a further alternative, theshape of the opening could be changed to be circular or elliptical, forinstance, or it could be configured with a different geometric shapealtogether.

In each of the various arm restraint attachments described above, theretaining member and the connector arm are configured to be detachablefrom each other. This need not be the case in every application. In analternate embodiment, the retaining member may be permanently fixed tothe connector arm.

A preferred embodiment and several alternative embodiments of thepresent invention have been described above. However, it should beappreciated that the isometric exercise apparatus could be modifiedfurther still in accordance with the principles of the presentinvention. For instance, in the preferred embodiment, the isometricexercise apparatus 20 is configured for a single user. In an alternativeembodiment, the apparatus could be modified by constructing a relativelylarger base provided with two side-by-side exercise platforms sharing acommon sidewall. In such a case, the common side wall would be providedwith foam pads and bores on both of its faces. Each user would performhis/her exercises on his/her respective exercise platform. This modifiedapparatus could be used, for instance, in an exercise class setting.

Although the foregoing description and accompanying drawings relate tospecific preferred embodiments of the present invention as presentlycontemplated by the inventor, it will be understood that variouschanges, modifications and adaptations, may be made without departingfrom the spirit of the invention.

What is claimed is:
 1. An apparatus for performing isometric exercisescomprising: a frame having a base and a sidewall joined to the base, thebase having an exercise area within which a user's body is positionable;the base having a pair of opposed, first and second, spaced apart sides;the sidewall lying adjacent the first side of the base; a restraint armassembly connected to the frame, the restraint assembly including: aswing arm pivotable relative to the base; a restraint arm carried by theswing arm and positionable above the exercise area to inhibit movementof a portion of the user's body so as to allow the user to performisometric exercises; the restraint arm extending across the exercisearea between the swing arm and the sidewall; an indexing assemblydisposed adjacent the second side of the base opposite the sidewall forfixing the swing arm in a predetermined angular position selected from aset of discrete angular positions relative to the base; and at least onelimb restraint accessory positionable at predetermined locations alongthe base for inhibiting movement of the user's limb so as to allow theuser to perform isometric exercises.
 2. The isometric exercise apparatusof claim 1 wherein the base is hingedly connected to the sidewall. 3.The isometric exercise apparatus of claim 2 wherein: the sidewall ismoveable between a first, in-use position and a second, out-of-useposition; when in the first, in-use position, the sidewall is orientedat least substantially perpendicular to the base; and when in thesecond, out-of use position, the sidewall is collapsed against the base.4. The isometric exercise apparatus of claim 1 wherein the restraint armassembly is releasably connected to the frame.
 5. The isometric exerciseapparatus of claim 1 wherein the indexing assembly includes an indexingplate mounted to the base and an indexing pin releasably engageable witha portion of the indexing plate and a portion of the swing arm to fixthe swing arm to the indexing plate.
 6. The isometric exercise apparatusof claim 5 wherein: the indexing plate has a plurality of indexingapertures defined therein, each indexing aperture corresponding to oneof the predetermined angular positions; the swing arm has a first endpivotally connected to the base, a second end attached to the restraintarm and includes at a location intermediate the first and second ends abore; the bore of the swing arm being alignable with one of the indexingapertures to allow insertion of the indexing pin therethrough.
 7. Theisometric apparatus of claim 6 wherein the plurality of indexingapertures are disposed in a semi-circular arrangement along the indexingplate.
 8. The isometric exercise apparatus of claim 5 wherein theindexing assembly is provided with locking means to preventdisengagement of the indexing pin from the indexing plate and the swingarm.
 9. The isometric exercise apparatus of claim 1 wherein therestraint arm has a first portion attached to the swing arm and a secondportion releasably connected to the sidewall.
 10. The isometric exerciseapparatus of claim 1 wherein: the sidewall has defined therein aplurality of indexing bores; each indexing bore corresponds to one ofthe predetermined angular positions and is configured to receive thesecond portion of the restraint arm.
 11. The isometric exerciseapparatus of claim 10 wherein the indexing bores are disposed in asemi-circular arrangement along the sidewall.
 12. The isometric exerciseapparatus of claim 1 wherein the base includes a plurality of slotsdefined in the base, each slot being disposed at one of thepredetermined locations and configured to receive a portion of the atleast one limb restraint accessory therein.
 13. The isometric exerciseapparatus of claim 12 wherein: the base has a third side extendingbetween the first and second sides, and a fourth side opposite the thirdside and extending between the first and second sides; and the pluralityof slots includes at least one slot disposed along the first side, atleast one slot disposed along the second side and at least one slotdisposed along the third side.
 14. The isometric exercise apparatus ofclaim 12 wherein: the base has a longitudinal axis and a transverse axisperpendicular to the longitudinal axis; at least some of the slots ofthe plurality being oriented generally perpendicular to the longitudinalaxis of the base.
 15. The isometric exercise apparatus of claim 14wherein at least some of the slots of the plurality are orientedgenerally perpendicular to the transverse axis of the base.
 16. Theisometric exercise apparatus of claim 14 wherein at least some of theslots of the plurality are canted relative to the longitudinal axis ofthe base.
 17. The isometric exercise apparatus of claim 12 wherein theat least one limb restraint accessory includes: a connector armconfigured for insertion into one of the plurality of slots; and aretainer member supported by the connector arm for restraining a portionof the user's limb.
 18. A kit for an isometric exercise apparatuscomprising: a frame having a base and a sidewall joinable to the base,the base having an exercise area within which a user's body ispositionable; the base having a pair of opposed, first and second,spaced apart sides; the sidewall positionable adjacent the first side ofthe base; a restraint arm assembly connectable to the frame, therestraint assembly including: a swing arm mountable for pivotingrelative to the base; a restraint arm mountable to the swing arm andpositionable above the exercise area to inhibit movement of a portion ofthe user's body so as to allow the user to perform isometric exercises;the restraint arm being positionable to extend across the exercise areabetween the swing arm and the sidewall; an indexing assembly beingpositionable adjacent the second side of the base opposite the sidewallfor fixing the swing arm in a predetermined angular position selectedfrom a set of discrete angular positions relative to the base; and atleast one limb restraint accessory positionable at predeterminedlocations along the base for inhibiting movement of the user's limb soas to allow the user to perform isometric exercises.
 19. A kit for anisometric exercise apparatus and storage rack therefor comprising: acollapsible frame having a base and a sidewall joinable to the base, thebase having an exercise area within which a user's body is positionable;the base having a pair of opposed, first and second, spaced apart sides;the sidewall positionable adjacent the first side of the base; arestraint arm assembly connectable to the frame, the restraint assemblyincluding: a swing arm mountable for pivoting relative to the base; arestraint arm mountable to the swing arm and positionable above theexercise area to inhibit movement of a portion of the user's body so asto allow the user to perform isometric exercises; the restraint armbeing positionable to extend across the exercise area between the swingarm and the sidewall; an indexing assembly being positionable adjacentthe second side of the base opposite the sidewall for fixing the swingarm in a predetermined angular position selected from a set of discreteangular positions relative to the base; at least one limb restraintaccessory positionable at predetermined locations along the base forinhibiting movement of the user's limb so as to allow the user toperform isometric exercises; and a rack structure for suspending theframe when in a collapsed state.